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Best Free Antivirus Software

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Antivirus software provides an essential layer of protection from viruses, trojans, worms, spyware, adware, dialers, keyloggers, and rootkits. However, don't let the name antivirus confuse you. These days every good antivirus has good detection rates for all forms of malware, not just viruses. The term malware includes viruses, trojans, worms, spyware, adware, dialers, keyloggers, rootkits, and any other software which performs malicious activities on a computer.


Sadly, the amount of malware currently in circulation is so large that no antivirus could possibly detect all of it. Despite vendor's claims, no single antivirus solution can detect nearly all new malware. There are some products out there, including some in this review, which include technologies which are able to adequately protect a computer, but any product which relies mainly on detection is statistically doomed to fail eventually. Also, using more than one real-time antivirus at the same time uses much more system resources, can cause system errors, and can even reduce protection due to unintended conflicts. For my advice on how to compensate for these weakness of antivirus products please see my other article about How to Stay Safe While Online. Having a good antivirus product does go a large way towards adequately protecting your computer, but in this day I would highly recommend that you add additional layers to your security arsenal.


Below I have reviewed some of the most effective Free Antivirus products currently on the market. In order to make this review more unbiased, although I do of course admit that my own intuition and experience does affect my judgment as well, I came up with a particular methodology for comparing these products. This methodology is described in the following section.

Recent Changelog:

10/7/2014-Re-inserted explicit statement mentioning that I am a volunteer moderator (not employee) on the Comodo forums.

10/9/2014-Linked to instructions on how to make sure Bitdefender Free can be installed in English, and added MSE to list of unsuitable AV's.

11/14/2014-Added additional information about Bitdefender Free.

Methodology For Comparing Products

The main motivation behind why I came up with this particular methodology for this review is that I value system protection against real world threats above all other categories by which an antivirus is commonly judged. It does not matter to me whether an antivirus protects the user by detecting malware, blocking dangerous sites, behavioral analysis, sandboxing, or any other approach. The most important thing is that at the end of the day your system is safe from infection. Thus, that is the attitude I have taken towards reviewing these products. My criteria is entirely based on protection, not cleaning. Therefore, if you believe your computer may be infected please first see my article on How to Know If Your Computer Is Infected before continuing to read the rest of this article.


I have located reputable Antivirus testing organizations which claim to test products against situations which resemble real-world situations. I narrowed these down by further requiring that the organizations have a relatively long record of producing good, seemingly unbiased, results. The organizations I ended up with, and therefore used for this review, are:



Dennis Technology Labs

From here I looked at all tests spanning back over the last two years. However, if there were more than three tests within that range I used only the most recent three. Also, if given the choice between results from different operating systems, I chose that for the most popular operating system. At the moment Windows 7 is the most popular operating system.

Also, I only considered results if it was specifically the Free Version which was tested. This is because the results for the Paid Version of the products in this review, with the exception of Comodo Antivirus (which has the exact same protection for its Free and Paid versions), are often quite different from those for the Free versions. Many marketing teams try to cloud this difference, but for the purposes of getting the most reliable information I am strict about this. Unless it can be explicitly proven that every protection mechanism is exactly identical to the free version the results for paid products are not considered in this analysis.

In addition, I did not count it against any of the products if they were not tested by multiple organizations. As long as they were tested by at least one, within the above-mentioned period, they were considered. This criteria was chosen because there are many reasons to choose not to participate in a test. Thus, it should not be held against the product if they were not tested by multiple agencies. However, if they were not tested by any, this makes it impossible to compare them in an unbiased fashion.


Once this data was collected, I then looked at the overall results for the Free Antivirus products discussed in this review, and ordered them mainly according to the quantitative results. However, my own knowledge of the products, and the reviews and experiences of others, were also considered. The results are presented and discussed below.

Discussion And Comparison

Comodo Antivirus is my top pick for advanced users, or for Intermediate users who are okay with an antivirus software which will occasionally ask them for input. However, if you do not fall into those categories, or for any other reason find it to not be a good fit for you, then you will likely find my next pick suitable. Also, for those who prefer a complete solution, there is always Comodo Internet Security (CIS), which is also free and includes a firewall in addition to all other components which already come with Comodo Antivirus.

Firstly, I will note that I am a volunteer moderator (not employee) on the Comodo forums. However, this is certainly not the reason I chose this for the number one position. The reason I made this my top pick for advanced users or users who are okay with a somewhat talkative antivirus software, is because it is the only product which I feel confident saying that it will protect you against nearly 100% of real-world threats. This is because it maintains a white-list of known safe applications. Then, all unknown applications, which include all unrecognized malware, will be sandboxed and isolated from the rest of the system. Thus, this product provides very strong protection against even zero-day malware.

Comodo Antivirus also uses the cloud to facilitate the detection of the most recent malware, as do many other Free Antiviruses reviewed in this article. It will also analyze unknown applications for suspicious behavior, and alert the user accordingly. However, as mentioned previously, users who do not want a somewhat talkative antivirus should continue to my next pick. Also, by default Comodo Antivirus has small advertisements (which can be disabled as shown here). Also, please see my notes in the Quick Selection guide for advice on how to avoid unwanted software during installation.


Panda Cloud AntivirusPanda Cloud Antivirus is an excellent choice for average users, who may find Comodo Antivirus too confusing. It has a simple interface, completely automated features, access to cloud-based protection, and has been shown to be very good at protecting a computer. Panda Cloud Antivirus has a behavioral blocker, web protection, and access to cloud-based protection, all of which will help increase your security. The protection offered by this product is very strong. However, do note that it will auto-quarantine files which it believes to be dangerous.




Avast! Free AntivirusAvast! Free Antivirus has very good protection rates. Avast has many different protection shields, boot-time scanning, a behavioral blocker, an internet site ratings plugin, script malware protection, and access to cloud-based protection. It's arguable whether their ratings plugin offers comparable levels to Web of Trust, but the script malware protection can prevent certain browser exploits, a feature not available in any of the other free AV's reviewed.

However, do note that Avast requires a free registration to function after 30 days, and the default installation installs the Chrome browser unless you uncheck it. Also, note that the OpenCandy advertising component is integrated into the Software Updater tool in Avast. More information about OpenCandy can be read here. Thus, if a user selects this option during the install they will end up with OpenCandy on their computer. My advice would be that if you want to install Avast you should not use the Software Updater tool.


AVG Anti-Virus Free EditionAVG Anti-Virus Free Edition is also a good choice for average users. My analysis of the results, as discussed in the methodology section, does show that it does a decent job of protecting your computer. However, it appears that the above Antivirus products tend to do better. Also, it comes with advertisements (but they can be disabled).





360 Total Security is also a good choice for average users. Although it has gotten some very stellar reviews, the results I found from looking at the results from the testing agencies referenced earlier in this article show that the protection it provides is roughly the same as AVG, but certainly not as effective as Comodo, Panda, or Avast. This product uses multiple antivirus engines to detect malware. It has cloud protection, and also uses the Avira and BitDefender engines, although these are not enabled by default. For more information about this antivirus, see the separate article on this page.

Avira AntiVir Personal EditionAvira AntiVir Personal Edition is another product which has a very good reputation. However, the free version was not tested by any of the three testing organizations I referenced in my methodology. Therefore, I cannot currently recommend it above any of the previously mentioned products.

However, other comparative tests do show that it has very high detection rates for malware. Also, many users have used it and found that it is very effective. Also, Avira provides access to cloud-based protection. AntiVir is certainly a good choice for a free antivirus, but due to the lack of real-world testing, at this time I cannot recommend it above the other products in this review. Hopefully in the future they will have the free version tested by these organizations as well.



Bitdefender Antivirus Free Edition

Bitdefender Antivirus Free Edition is another free antivirus product which has a very good reputation. However, the free version was not tested by any of the three testing organizations I referenced in my methodology. Therefore, I cannot recommend it above any of the previously mentioned products.

The engine for this product appears to be very similar the commercial product, although there are some tweaks. However, the level of protection provided has not been shown conclusively to be identical with the paid version, which is why I did not use the results for the paid version in my analysis. Bitdefender Free has both local and cloud-based definitions. Thus, users always have access to the most up-to-date definitions. It also has an effective heuristics engine, and uses a component called the Active Virus Control to monitor applications in real-time for suspicious behaviors. In addition it also has a webshield, which seems quite effective at protecting users from both malware infested and phishing sites.

The user interface for this product is very minimalist. Thus, it may be attractive for novice users, although more advanced users may be frustrated at the lack of customization. However, it has no offline installer, and it also requires registration to continue using it past 30 days. Bitdefender Antivirus Free Edition is a good choice for a free antivirus, but due to the lack of real-world testing, at this time I cannot recommend it above the other products in this review. Hopefully in the future they will have the free version tested by these organizations as well. Also, note that if you are having trouble getting Bitdefender Antivirus Free Edition to install in English please follow the steps in this post.


Please help us by rating this review

End-Note: Please note that I also looked into Forticlient , Kingsoft, and Microsoft Security Essentials. However, I found that the protection offered by these products is subpar. Thus, if you are considering using Forticlient or Kingsoft I would strongly recommend that you instead consider another of the products reviewed in this article.

Related Products and Links

Other Articles By Chiron

Related Free Antivirus Software Articles

Related Security Articles

Have Your Say

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Quick Selection Guide

Comodo Antivirus
Gizmo's Freeware award as the best product in its class!

Runs as a stand-alone program on a user's computer
This has full real-time protection capability, including real-time antivirus, behavioral blocking features, cloud-based protection, and an automatic sandboxing function which protects users from nearly all malware.
The automatic sandboxing function, although not very intrusive, may be too talkative for some users. Also, by default non-intrusive advertising is enabled (although it can easily be turned off). Also, Comodo Secure DNS, which is offered with Comodo Antivirus during installation, tends to have many false positives. Thus, I would suggest that you untick the option to Enable Comodo Secure DNS during installation.
Version 6.x
32 and 64 bit versions available
Unrestricted freeware
There is no portable version of this product available.
Windows XP, Windows Vista, Windows 7, Windows 8.x

Take care to avoid the installation of unwanted software during installation. To do this use the customized installer button, which is on the lower left-corner of the screen during installation. Additional software, including a browser, an ad-blocking addon, and an option paid service which would allow Comodo technicians to help you with computer problems, are all included by default.
Also, I would suggest that you untick the option to Enable Comodo Secure DNS during installation. It tends to falsely block many safe pages.
Also, note that although the download page linked to above does not list Windows XP as being supported, Windows XP x32 is fully supported, although Windows XP x64 has significant limitations.

Panda Cloud Antivirus
Combines a web service with a stand-alone program
High detection rate of malware, web protection, some behavioural blocker features
Detection rates of real-world malware is slightly lower
Version 2.x
32 and 64 bit versions available
Free for private use only
There is no portable version of this product available.
Windows XP, Windows Vista, Windows 7, Windows 8.x
Avast! Free Antivirus
Runs as a stand-alone program on a user's computer
This has full real-time capabilities, behavioral blocking features, script malware protection, and a low rate of false positives.
Default settings require certain user interaction. It is bundled with Chrome browser by default, and if not carefully avoided during installation the user may accidentally install OpenCandy (see discussion for clarification).
Version 9.x
32 bit but 64 bit compatible
Feature limited freeware
There is no portable version of this product available.
Windows 2000, Windows XP, Windows Vista, Windows 7, Windows 8.x, Mac OS

Take care to avoid the default inclusion of the Chrome browser and OpenCandy during the install process by using the custom install option. The attempt to install these will also be repeated at the program update if the automatic option is chosen.
Quick Start Guide:

AVG Anti-Virus Free
Runs as a stand-alone program on a user's computer
Behavioural blocker
Slightly lower signature detection rates
Version 2013.x
32 and 64 bit versions available
Free for private use only
There is no portable version of this product available.
Windows 2000, Windows XP, Windows Vista, Windows 7, Windows 8.x

Forum for support

360 Total Security
Runs as a stand-alone program on a user's computer
Contains many engines for malware detection.
Avira and Bitdefender engines are not enabled by default.
32 bit but 64 bit compatible
Unrestricted freeware
There is no portable version of this product available.
Windows XP, Windows Vista, Windows 7, Windows 8.x
Avira AntiVir Personal Edition
Runs as a stand-alone program on a user's computer
Outstanding detection of malware
Not the most user friendly
Version 14.x
32 bit but 64 bit compatible
Free for private use only
There is no portable version of this product available.
Windows 2000, Windows XP, Windows Vista, Windows 7, Windows 8.x
Bitdefender Antivirus Free Edition
Runs as a stand-alone program on a user's computer
High detection rates, very user friendly
Lack of customization, no offline installer, requires registration after first 30 days
Version 1.x
32 bit but 64 bit compatible
Free for private or educational use only
There is no portable version of this product available.
Windows 2000, Windows XP, Windows Vista, Windows 7, Windows 8.x


This software category is maintained by volunteer editor Chiron. Registered members can contact the editor with any comments or questions they might have by clicking here.


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by cavehomme on 13. July 2013 - 10:22  (109195)

Webroot is very good, but it's not free.

by Anupam on 13. July 2013 - 13:29  (109197)

I have been using Avast on my system for years now, and I can say that it runs very light. I have used it on XP previously, and now am running it on a Windows 8 PC. Even with the web shield on, it runs very light, and does not slow down the computer, or the browsing in anyway.

I have also installed it on other systems too, of my friends and relatives, and in their PCs too, it runs light, and without slowing the system.

I think you should look at other factors on your system, like other security software that you might be using along with Avast.

by cavehomme on 14. July 2013 - 12:25  (109219)

I don't run any other security software in realtime. The only things I can potentially think of may be old AVs perhaps not fully cleared out despite using uninstall tools and CC registry cleaner. However, it was the same browsing problem with Avast and Gdata and I understand that Gdata uses the Avast engine. Anyway, it's removed and I have decided to revert on my main machine to Comodo AV.

by JonathanT on 15. July 2013 - 3:06  (109244)

This is a good point, thanks for bringing it up. As I always install software with custom settings I did not realise the severity of this.

by JonathanT on 15. July 2013 - 3:08  (109245)

BitDefender free is an on-demand AV. I haven't been keeping up with Immunet lately but afaik it's detection rates are subpar - MC might know more about this! Again I'd recommend just sticking to the tried and tested software listed here. :)

by MidnightCowboy on 15. July 2013 - 4:51  (109246)

Bitdefender free is now a completely different program including real time protection. When it was first released it was quite restricted regarding settings but in response to user feedback this has now been improved.

The test results quoted on their site are somewhat misleading because they refer to the commercial edition and it is not clear exactly which components (and how much of them :)) are contained in the free version.

"Some of these technologies, also common with our main product line, have allowed Bitdefender to outpass major competitors such as AVG, Avast or Avira".

If though the only items missing are components like Safepay and the AV engine, signatures and heuristic capabilities are the same then this would be more than adequate for general home use. MC - Site Manager.

by cavehomme on 15. July 2013 - 6:22  (109247)

It appears that Bitdefender may have now removed their free program. Even clicking the "Free Antivirus" link at the bottom right side of their main page does not such thing, unless it's a temporary glitch.

by MidnightCowboy on 15. July 2013 - 7:25  (109248)

The download is working fine for me from the page I linked above. Softpedia is an alternative source and also lists the recent changes. MC - Site Manager.

by AJNorth on 15. July 2013 - 11:41  (109256)

Neil Rubenking has a recent article in PC Magazine, "Microsoft Security Essentials and McAfee Fail Security Certification," discussing the Dennis Technology Labs real-world testing results for several anti-malware apps, including avast! Free Antivirus 7, AVG Anti-Virus FREE 2013 and Microsoft Security Essentials -- . (User comments at the bottom are also worth a look.)

It will be interesting to see if MSE fares any better in formal testing when its next version is released (v4.3.215.0 pre-release is available for download from Softpedia --

by AJNorth on 15. July 2013 - 12:29  (109257)

Avira have updated their Free Antivirus to v13.0.0.3882; 102 MB (off-line installer), 2 MB (on-line) (2013.07.12) -- (As of this writing, Avira have yet to update their product's nomenclature at their site, though the version supplied is the current one.)

With this release they have eliminated the “Expert mode” from the Configuration panel (all options are now displayed as if this mode were always activated, saving one click and making the User Interface a tad cleaner); they have also included another cumulative roll-up.

by JonathanT on 20. July 2013 - 1:05  (109417)

Thanks for the heads up!

by LynVT (not verified) on 22. July 2013 - 13:15  (109478)

I posted a long time ago trying to find a way to (completely) avoid the (obnoxious) Avira nags and finally gave up and switched to Avast. I'll do a more scientific comparison soon, but pretty sure Avast uses the same amount of memory or less than Avira at least on my old pIII 512MB ram PC with XP pro (which is normally not as bad as you'd think for my needs, unless I have 400 tabs open in Firefox!)

I haven't had any infections with Avast (yet) albeit it has only been a few months, and went many years with zero infections with Avira. Although Avira worked well re protection for me, a couple of less tech-savvy clients DID get a couple of nasty infections (Trojans, one of which took down the whole system) with Avira running (albeit about 2 years ago)- so Avira is certainly not perfect re doing its job, of course, as I guess none of them are. (I have since placed these too-frequently infected clients on Limited User Accounts and so far no infections for them either...)

One thing I really like about Avast is a general software update feature like Secunia, which is a little less obtrusive and more user-friendly than Secunia, at least in my opinion, and combines AV and very important software updating alerts in one package.

by AJNorth on 23. July 2013 - 16:51  (109526)

Thanks for your post, LynVT.

As a long-time user of Avira Free A/V (on a dozen machines I tend to, XP through Win 7), I look forward to learning of your further experiences with Avast -- especially on older machines with limited resources (such as your P-III with 512 MB RAM).

To date, none of these machines has experienced a malware infection. (Avira's default settings were changed on every install, such as setting both heuristics to High, enabling every option under Additional Settings for the System Scanner, and selecting every threat category, except Unusual runtime compression, under the General tab. In addition, the Secunia PSI, WinPatrol and the COMODO Firewall are also installed.)

(For the record, the large nag screen pop-up has been successfully suppressed on every machine, though an occasional tweak is required after some major updates from Avira...)



by Anupam on 23. July 2013 - 18:10  (109530)

For a long time, I used Avast on my old PC with same config as yours.. P-III with 512 MB RAM. It used to run really light. Firefox did make system a bit slow :)... but was manageable with less tabs.

by LynVT (not verified) on 23. July 2013 - 21:53  (109534)

yeah, something is wrong with my Firefox settings- it is now using 235MB of RAM with only 2 tabs open (and only a few basic addons like ABP)- tried every Mozilla "tip" and also Chrome and not much better, at least a while ago. Anyway, right now AvastSVC.exe is using only 1.8MB and AvastUI.exe is using only 1.7MB of memory. SVC jumps to around 10MB when a new tab is opened, as one might expect, but pretty sure Avira sat at approx. 10-20MB when idle, jumping when opening a tab or file. That said, even 20MB is nothing to most (newer) PCs- Firefox is my problem, the hog...but that's another forum...

by LynVT (not verified) on 23. July 2013 - 22:03  (109535)

Hi AJN- I did have all the Avira machines set to maximum heuristics- had it scan everything- checked all threat categories except games and jokes. Didn't have Secunia running when they got infected (do now), and these users would be too confused by WinPatrol or a firewall other than the XP one (which I did have on), so they were flying in the wild with just Avira and the XP firewall- clearly not enough. I also added WOT to their Firefox and explained to "only go to WOT green sites". So I'm not sure if it is the Limited User Accounts or WOT or Secunia (or all of them), but these users who previously picked up infections quite often, have been clean now for several years.

What method do you use to suppress Avira nags? The one I used to use that worked stopped working about a year ago. Thanks for your comments.

by cavehomme on 23. July 2013 - 22:58  (109536)

Probably nothing wrong with your FF settings, simply that FF is a massive resource hog in my experience.

by LynVT (not verified) on 24. July 2013 - 13:20  (109559)

Yeah, I think you're right- can you suggest any alternatives for old PCs? NoScript seems to help, maybe, (and was it more or equally responsible for my zero infections in over 10 years than Avira?) but is kind of a pain and definitely not user-friendly enough for typical users- but it didn't help much. And Chrome was just as bad re hogging RAM with more than a few tabs (I tend to work with many), at least for me. The browser reviews I read gave the least use of RAM resource award to FF. With only a few tabs (less than 10-20) open (typically using FF, Office with big files, PDFXchange, and Thunderbird simultaneously), my PC is just as snappy and useful as much newer ones- so I hate to just trash it for both financial and ecological reasons. I'm changing my browsing habits by grouping tabs by "project" in bookmark folders and keeping only a few open at once- this brings my PC back to "snappy and happy" and is probably a more organized approach to working anyway...

I'm also going to try an SSD and also ReadyBoost- what the heck, why not? I can hear the HD toiling away when my tab number creeps up and FF jumps from RAM to "virtual memory" (i.e. the slow old mechanical HD), so this may solve the problem- will post results in a more appropriate thread..

Anyway, back to the topic, I will reinstall Avira and do a "scientific" test on memory use of Avira vs Avast (turning off one before testing the other of course) as soon as I get a chance...

by cavehomme on 24. July 2013 - 13:29  (109560)

I also changed to a SSD and it's MUCH faster, but I still do get slowdowns with most AV. Just been using Avast for the past 2 weeks and eventually had to remove it because of the impact on browsing speed - all browsers - FF22, IE9 and Seamonkey. I recommend you try Seamonkey as a FF alternative, I find it quicker. It's not as "modern" interface but it's faster and also many of the FF addons work on it, the engine is based on FF.

by Anupam on 24. July 2013 - 13:40  (109561)

The comments are going off-topic, and I will request you gentlemen to take this discussion to the forum please. Any more comments on browsers will be deleted.

by cavehomme on 24. July 2013 - 14:17  (109562)

Huh? Please don't be so trigger-happy, I was mentioning the real impact of Avast upon browsing speed. I concluded that the least impact was with Seamonkey. I have no desire to discuss generic browser topics here, merely relay some of my experience of 20+ years to help others, if they need it.

by Anupam on 24. July 2013 - 18:15  (109568)

My comment was not directed specifically towards yours, but to the whole discussion. Don't take it personally.

by LynVT (not verified) on 24. July 2013 - 18:47  (109569)

wuuuh? I, for one, greatly appreciate all the comments- very thoughtful and helpful. I think most people use their computers mostly for internet use and AVs are mostly to prevent damage during that use- so AVs and browsers are intimately related- how "good" a free AV is has very much to do with how fast you can browse with it on (however old or new the PC is)- so I don't think it is really much off-topic, if at all. It is very possible some browser/AV combinations work speedier than others, and that would be good info to know re the "best" free AV...

Also, I know you didn't mean it that way, but I found it a bit sexist to be called a "gentleman"- I am a woman.


by f0xx396 on 25. July 2013 - 16:53  (109600)

Malwarebytes anti malware I think deserves some mention here, granted its not a dedicated antivirus but its malware scanning I feel is on par with Avira.

I use Avast and malwarebytes as both allow for manual updates, a rare feature. This combined feature gives me the good I would have got from avira, but avira got in the way of my gaming. Avast has silent gaming mode feature, allowing my games to move along without interruptions. Avast version 8 is lot more lighter and resource friendly.

by MidnightCowboy on 25. July 2013 - 22:54  (109607)

Malwarebytes is featured on the appropriate pages of this site including these:

As the free version contains no real time protection, it is not suitable for inclusion in this review. MC - Site Manager.

by JediInverse on 26. July 2013 - 8:44  (109625)

BitDefender has recently updated their free Anti-Virus and the new version includes real time protection (about time IMO). As I understand it, the software is based on last years commercial AV product rather than the current release, but I do remember seeing some very good reviews for it at the time. The software itself is light and fast, very simple to use with very few settings or advanced options to play around with, in fact once installed you hardly know it is there. If you're looking for an install and forget AV package this may be the one. Will be really interested to see how you guys rate it against AVAST and the others.

Oh BTW I had to download it from the USA site, the version available on the UK site is still the old software with no real time protection. Just switch the country at the top of the screen to USA and then download the software.

by Anupam on 26. July 2013 - 8:51  (109626)

The free antivirus from BitDefender with real time protection has been around for quite sometime now. Although it seems good, but earlier, it did not come with much control, which many users saw as a disadvantage. Although, with recent versions, they have made a few changes to the product, as a result of the users feedback. We had a discussion on the product in the Freeware Forum. You can take a look:

by AJNorth on 30. July 2013 - 13:01  (109763)

Hello LVT,

Just wanted to check to see whether you had received my reply to your question, which I sent through your contact form at Gizmo's site (the Admins, understandably, are not enamored of open discussions on how to violate the EULAs of software we list...); it was titled "Avira Pop-up Suppression" (though other security-related issues are also discussed) and posted on 2013.07.23, at about 1721 (U.S. PDT). If not, please let me know where I might forward it to you. Thanks.



by rfithen on 4. August 2013 - 2:34  (109890)

The antivirus portion seems to work fine; but the program is blocking me from known good sites like: instantbird, portableapps download section, some downloads on sourceforge; etc. ....and when clicking "continue anyway" it does not seem to react properly. just my take.

by MidnightCowboy on 4. August 2013 - 5:35  (109891)

Antivirus programs are designed to protect their users. Within this process there are always likely to be some false positives.

Specific to your experience, I can't comment about Instandbird because I have no knowldge about how they operate but Sourceforge have recently introduced a wrapped installer (like cnet)
which will certainly explain Bitdefenders intervention there.

I always recommend users research what they want to install via Google first in case something is missed by their antivirus, in which case the above links would have provided the information necessary to make an informed decision.

Genuine false positives can and should be reported to Bitdefender for the benefit of other users.

MC - Site Manager.

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