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

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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 MidnightCowboy on 22. September 2014 - 8:01  (118731)

Indeed. The trolls enjoy their work however and must be really pleased with the result. Some might even suggest that one or more of the established names in the industry might have been involved. It's well known that some vendors employ legions of fanboys and trolls to post good and bad "reviews" online about competing products.

Thanks for spotting my typo above which is now corrected. :) MC - Site Manager.

by MidnightCowboy on 18. September 2014 - 7:31  (118656)

Tiranium is an interesting project but is just a one man show with a small team of "helpers". We won't be featuring this here (or anything else like it) unless it develops a lot further and begins participating in recognized independent tests. MC - Site Manager.

by Krieg C on 14. September 2014 - 20:08  (118584)

Well, I tried it, I'm sure it's a wonderful program, BUT, even after a careful installation, it nags the devil out of you to sign up for the stuff you didn't want. Have been using Bitdefender for a year, no problems. Before that, was using Avast, my favorite, but Avast changed something in their detection rules and it would not allow me the see my security cameras for remote sites. I have income properties in other states.
So, ran a scan with the Comodo antivirus, O (zero) detection. This tells me that the Bitdefender is doing its job, and I am ALL OVER the internet.
Sorry, I can't for the life of me see why anyone would rate this as their number 1 source for protection. It's intrusive, and it nags the heck out of to sign up for the add ons you didn't want in the first place.

by Chiron on 14. September 2014 - 21:10  (118585)

Were these messages you saw in the lower-right corner of the screen in a small popup window? If so, then I just added advice on how to disable these advertisements to the article. I apologize, I had meant to mention this previously, but forgot to include it in a previous revision.

by freestuffrocks on 2. September 2014 - 19:25  (118347)

Excellent review as usual Chiron. I'd been using the free Avast AV/Comodo firewall combo for about 2 years but problems with Avast updating and your favourable Comodo AV review led me to ditch Avast and replace it with the full Comodo Internet Security free suite. Much less hassle having everything in one place and not having to worry about conflicts and creating exclusions etc. Things are now noticeably quicker.

by Chiron on 3. September 2014 - 16:13  (118363)

I'm happy to hear that. It's very nice that users have the choice of whether to use Comodo Firewall with Avast Free. They are a very nice combination.

However, I personally also use Comodo Internet Security, and prefer it to any other combination. That said, each computer, and computer user, is different. Thus, the more top-quality options which can be presented the better.

Thank you very much for letting us know that Comodo Internet Security worked very well for you. If you run into any problems, or have any questions/suggestions, please do let us know.

Thanks again.

by freestuffrocks on 4. September 2014 - 19:17  (118383)

One thing I didn't mention was what a nightmare it was to uninstall Comodo firewall to do a clean install of CIS Premium, even using your guide on the Comodo forums (Revo, both removal tools etc). Lost internet connection, CIS wouldn't install and restore wouldn't work due probably to either remnants of Avast or Comodo firewall. I finally got everything to work a considerable time later.

by Chiron on 4. September 2014 - 22:29  (118390)

Did you make sure that the firewall driver was correctly removed before rebooting into Safe Mode? Sadly sometimes that is not removed by the uninstaller, and I don't believe the removal tools correctly remove that either.

Either way, it is true that Comodo Firewall doesn't always uninstall easily. However, the methods I suggested, which you followed, will allow it to nearly always uninstall correctly. It seems that you ran into some bad luck. By the way, how did you eventually get it to work?


by freestuffrocks on 5. September 2014 - 10:50  (118397)

You're right about the firewall driver. Neither removal tool nor the uninstaller removed it. Your advice to remove it manually is several steps after rebooting into safe mode, so it hadn't been removed before doing this.

Regarding how I managed to get things to work, things are a little hazy due to a fair bit of red mist, but I went through the uninstall procedure again with Avast (2 removal tools like Comodo) and Comodo Firewall, still wasn't able to install CIS but at least restore then worked so as a last resort I restored to before trying to uninstall Comodo Firewall, and just went through the whole laborious process again and eventually it worked.

by Chiron on 5. September 2014 - 13:26  (118402)

I think perhaps I should move the advice about manually removing the firewall driver into the main advice section of my topic. Then again, it's not something which most users would like to do. I'll have to think about it some more, but your experience has given me a lot to think about.

Thank you.

by darrin71 on 7. September 2014 - 0:38  (118162)

Good Day A ! Hi George.J ! I am a current user of 360 IS and am considering switching to 360 TS for support reasons as you know. I'm curious if you could tell me more about your experience with 360 TS compared to 360 IS regarding detection rate, resource usage, boot up time, scan time, and how well 360 TS plays with other software, such as MBM and SAS. Never mind George, I have already found answers to my questions.

by George.J on 12. September 2014 - 15:19  (118539)

Well am back to using 360IS again. The reason is 360TS requires more resources on my system. The TS version uses around 150MB RAM while the IS version is very lightweight, using only around 30MB.

Additionally 360TS adds other features like SpeedUp, Junk CleanUp etc, which aren't actually required for me, although it might be useful for others. While 360IS is clean as a whistle, guess it's the best antivirus I've ever used. Sadly the product isn't updated frequently like 360TS version. :(

For a comparison betweeen 360 IS and TS in detection check this video review.

If you want to watch various community video reviews, you've got
360TS MazaiTest
360IS Review
360TS viktik
360TS without BD and Avira engines>
360TS yigido

Overall excellent results from all sides :)

by MidnightCowboy on 12. September 2014 - 16:07  (118540)

I agree with your findings although with an i5 and 8G in my dual booted desktop I'm not too bothered about resource use for anything. Unfortunately, 360IS is being discontinued in favor of 360TS so I'd rather use something that is being fully supported. MC - Site Manager.

by George.J on 12. September 2014 - 16:34  (118542)

360IS isn't discontinued. It just had an update today :D

It's just that they are concentrating more on the TS version.

by MidnightCowboy on 12. September 2014 - 16:40  (118543)

Not yet it's not, but their plan is for TS to replace 360IS, although they haven't said when. MC - Site Manager.

by George.J on 13. September 2014 - 8:50  (118562)

Honestly performance matters to me. Here's my findings

360TS is much heavier on the system than IS version.

Idle Memory Usage
360TS - >150MB RAM
360IS - <40MB RAM

Scanning Memory Usage
360TS - 320MB RAM , high CPU usage touching upto 95% at times, Disk Usage is also very high
360IS - <60MB RAM, low CPU usage less than 25%, Disk Usage very low.

You can see the difference. :D It doesn't matter if 360IS doesn't get product updates, I think I'll continue to use it. Maybe I'll stick with TS version on my gaming system. Still it's too heavy.

by TiagoDM on 29. July 2014 - 15:38  (117654)

Please consider Qihoo 360 internet security:

Very well reviews product in

Thanks for doing this.


by George.J on 1. August 2014 - 12:41  (117686)

Am back to using Qihoo 360 IS, and it's been excellent. Excellent independent lab test results, very light on resources and clean installer (which is not the case with most free antiviruses). The Total security version is too much for me, as it also includes Avira engine excluding the BitDefender engine, which is not needed for me. But overall, a perfect suite.

Moreover, it's good to see that Avira is offering a clean installer, which was not the case in the past. And also it's lab results are among the best.

Had to switch from Panda as it was slowing down my system to a crawl :(

by George.J on 20. August 2014 - 11:09  (118086)

Update: It seems that the company has switched from 360 Internet Security (IS) and is favoring the Total Security (TS) version, as the last IS version dates back to January.

So far 360 Total Security has been amazing for me. Works great as an antivirus and as a total security suite.

Great performance, high detection, better zero day expolits (registry, files & system protection), keylogger detections, support and frequent updates, makes it awesome.

By the way am using only the BitDefender engine, but even with Avira engine enabled it still seems very light. But I don't wanna go around and update Avira engine, so not using it.

by Chiron on 1. August 2014 - 16:36  (117688)

Qihoo is not a bad choice at all. I'm also happy to hear it's light on your system. From what I have heard Panda is generally light as well. However, the heaviness of an AV is always, to an extent, system specific. Thus, you may find that when you get a new computer it is Panda that is lighter and Qihoo which is heavier.

Thank you.

by George.J on 2. August 2014 - 1:58  (117692)

Honestly I expected Panda to be lightweight considering it being cloud antivirus. But the results just mirrored the lab tests at AV-Test with Panda rated lowest in performance, and lower than other Free antiviruses at AV-Comparatives for performance.

But like you said, it also depends from system to system.

by Chiron on 29. July 2014 - 17:47  (117657)

I will be considering them for my next major revision.


by gem on 21. July 2014 - 14:04  (117464)

It has been a long time since someone suggested Kingsoft Antivirus 2012 to be taken into consideration as possible antivirus solution. (see: and (

Few months after that there was a quite interesting discussion about the possibility to run Kingsoft Antivirus 2012 alongside other AV without conflicts. This discussion did not end very well meaning there was no clear conclusion to the matter. (see:

I come back here today with Kingsoft Antivirus 2012 (Cheetah) SP5.7 ( because i have been testing it for a while alongside KIS2013 on a pc with Win XP and on a pc with Win 7 64. I can tell you that i am quite impressed. No conflicts or compatibility problems so far. It is a cloud based antivirus, very light, with useful features, ability to fix vulnerabilities, USB defense function and it claims to be "Perfectly Working with Other Antivirus, Provides Outstanding Protection to End Users.". Although the software itself doesn't update frequently, the virus libraries do.
An interesting fact is that the company that makes the software is Chinese and apparently is no other than the guys from Cheetah Mobile that make known apps like Clean Master, Battery Doctor and CM Security for Android.

I just thought maybe we should give this one, another chance.

[Moderator's note: Link to non-English site edited out. Not allowed as per site rules.]

by Chiron on 25. July 2014 - 12:50  (117580)

Thanks for pointing this out. I will look into Kingsoft for the next update.

by gruff on 14. July 2014 - 17:25  (117327)

I've tried Comodo Antivirus and Avast and could not get either of them to install on XP SP3. Comodo was the worst. Three times I got to the 71% point (it also stops and reboots your computer at the 43% and 51% marks) and it told me that it failed to install and to install it manually, but how in the hell do I do that?

Then the 4th time it told me it was installed, but it wasn't. The only thing it installed was it's geekbuddy software, which apparently is the only help available for the free version. I have to say, both Comodo and Geek Buddy are rude and arrogant and want nothing to do with people who install the free version.

I'm now about to try Panda's Antivirus. One of these HAS to work, no?

by Chiron on 24. July 2014 - 15:04  (117549)

I'm sorry to hear about this. It sounds to me like there may be an issue with your computer. Perhaps another program is actively interfering, there is some sort of corruption, or remnants from a previously removed software are interfering in some way. If you make a topic for this in the forum, and send me a link to it, I can try to help.

by mrmxyzpltk (not verified) on 20. August 2014 - 2:32  (118080)

FYI, I just visited the Comodo site using the link provided in the article. Download page states that Comodo free AV is for "Operating System: Windows 8, Windows 7, Vista", but nothing about WinXP. So I would not put it down to a computer problem - it's the second time this week I've run into this situation (I have a laptop and desktop w/XP, a desktop w/8.1). I'm sure that this will increasingly be the case, and wonder how many of the other AVs listed in the article no longer support XP. (No disrespect meant to the author - things change quickly.)

by Chiron on 21. August 2014 - 1:27  (118108)

Thank you very much for pointing this out to me, and I very much do encourage that any reader who notices an issue brings it to my attention. I do keep track of all issues reported, and, if possible, these will be addressed as soon as possible.

For this situation, I have edited the Quick Selection part to now explain this situation. There is an issue where there are significant limitations to Windows XP x64. These are such that if you are running the 64 bit edition I would advise that you use a different AV instead. However, Windows XP x32 should work fine.

Please let me know if this answers your question, or if you have noticed any other issues. Anything you can bring to my attention would be appreciated.

Thank you.

by sicknero on 14. July 2014 - 21:13  (117332)

I guess you've been a bit unlucky - I've run CIS free for two or three years now with very few problems, although I do always install onto a clean system.

I've not tried GeekBuddy but the Comodo forums can be helpful.

by MidnightCowboy on 15. July 2014 - 5:33  (117337)

We encounter these issues all the time with a variety of products and they are always local, due mostly to corrupt system files or the incomplete removal of other security software. MC - Site Manager.

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