Free Windows Desktop Software Security List - Scanners [1]
ScannersInformation:
Understanding tech language: The difference between malware and a virus [4]
Not All “Viruses” Are Viruses: 10 Malware Terms Explained [5]
Guides:
How to Know If Your Computer Is Infected [6]
How to Clean An Infected Computer [7]
The Basics of Manual Malware Identification and Removal [8]
Elitekiller [9]
Select Real Security [10]
Majorgeeks: 1 [11]; 2 [12]
Bleepingcomputer [13]
Geeks to Go [14]
Deletemalware [15]
Remove-Malware.com [16]
overclock.net [17]
MakeUseOf [18]
How to remove a virus when your computer won't work [19]
Forums:
Bleepingcomputer [20]
Dslreports [21]
Malware Removal [22]
Geeks to Go [23]
What the Tech? [24]
Tech Support Forum [25]
Majorgeeks [26]
General-purpose scanners that use signatures:
Subsections follow.
1. Applications that work within a Windows installation:
Subsections follow.
1.1. Information:
Best Free Trojan Horse Scanning And Removal Software [27]
Best Free Spyware And Adware Remover [28]
23 Free On-Demand Virus Scanners [29] (with reviews)
11 Free Online Virus Scanners [30] (with reviews)
1.2. One scanning engine:
Subsections follow.
1.2.1. Can remove malware (for the free version, if there is also a paid version):
9-Lab Removal Tool [31]
Avira Command Line Scanner [32]; Scancl GUI [33]
Avira PC Cleaner [34]
Cezurity Antivirus Scanner [35]
ClamWin [36]; ClamWin Portable [37]
ComboFix [38]
Comodo Cleaning Essentials [39]
Dr.Web CureIt [40]
eScanAV Anti-Virus Toolkit [41]
ESET Online Scanner [42] 
F-Secure Online Scanner [43]
Kaspersky Virus Removal Tool [44]
Malwarebytes Anti-Malware [45]
Zemana AntiMalware [46]
McAfee Stinger [47]
Microsoft Malicious Software Removal Tool [48]
Microsoft Safety Scanner [49]
Norascan [50]
Norton Power Eraser [51]
Panda Cloud Cleaner [52]; Panda Cloud Cleaner portable version [53]
RogueKiller [54]
[55]Sophos Virus Removal Tool [56]
Spy Emergency [57] (trial; on-demand functionality is still available after trial period is over)
Spybot - Search & Destroy [58]; portable [59]
Superantispyware [60]; portable [61]
Trend Micro Anti-Threat Toolkit [62]
Trend Micro HouseCall [63]
Trend Micro Sysclean [64] (command-line and GUI scanner)
Vba32 Console Scanner [65] (command-line scanner)
VIPRE Rescue [66] (command-line scanner)
Webroot SecureAnywhere Antivirus [67] (trial; good at removing malware)
Zillya! Scanner [68]
Quickheal [69]
Botfree EU -list [70]
Adlice Diag [71]
1.2.2. Can't remove malware (for the free version, if there is also a paid version):
Bitdefender 60-Second Virus Scanner [72]
Bitdefender QuickScan [73]
BullGuard Online Virus Scan [74]
[75]Kaspersky Security Scan [76]
McAfee GetSusp [77]
McAfee Security Scan Plus [78]
Norton Security Scan [79]
Panda ActiveScan [80]
Quick Heal Online Scan [81]
1.3. Multiple scanning engines:
Subsections follow.
1.3.1. Can remove malware (for the free version, if there is also a paid version):
Emsisoft Anti-Malware [82]
Emsisoft Commandline Scanner [83]
Emsisoft Emergency Kit [84]
HitmanPro [85] (can't remove malware after trial period is over)
herdProtect [86]
Multi-AV Scanning Tool [87]
AntivirusMulti: review [88]; download [89]
1.3.2. Can't remove malware (for the free version, if there is also a paid version):
Metascan Client [90]
WinMHR [91]
2. Live media:
Kaspersky Rescue Disk [92]
Bitdefender Rescue CD [93]; Creating a Bitdefender Rescue CD on a USB flash drive [94]
Avira Rescue System [95]
Dr.Web LiveDisk [96]
F-Secure Rescue CD [97]
Panda Cloud Cleaner Rescue ISO [98]; Panda Cloud Cleaner rescue USB drive [99]
[100]AVG Rescue CD [101]
Windows Defender Offline [102]
eScan Rescue Disk [103]
Arcabit Rescue Disk [104]
Zillya! LiveCD [105]
Vba32 Rescue [106]
Comodo Rescue Disk [107]
ESET SysRescue Live [108]
G Data BootMedium [109] (on Tools tab)
Sophos Bootable Anti-Virus [110]
Trend Micro Rescue Disk [111]
Avast Rescue Disk [112]
Ubuntu Malware Removal Toolkit [113]
Comprehensive List of 26 Bootable Antivirus Rescue CDs for Offline Scanning [114]
Integrate multiple live media/ISOs into one live medium/ISO:
Sardu [115]
YUMI [116]
XBOOT [117]
Easy2Boot [118]
Scanners that use non-signature techniques:
Subsections follow.
1. General:
HitmanPro [85] (use Early Warning Scoring mode to avoid use of signatures)
Microsoft System File Checker [119]; Run System File Checker Offline [120]
AVZ Antiviral Toolkit: home [121] (translated to English); download [122] (translated to English)
Norton Power Eraser [51]
McAfee GetSusp [77]
Malware Scene Investigator [123]
RogueKiller [54]
Quick Heal DNAScan [81]
Norascan [50]
NoVirusThanks Malware Remover [124]
Hidden CMD Detector [125]
DensityScout [126]
Universal Virus Sniffer: English version [127]; home [128] (translated to English); review [129]
TrustWalk [130]
2. Alternate Data Streams:
StreamArmor [131]
ADS Spy [132]
StreamFinder [133]
ADS Tool [134]
AlternateStreamView [135]
Anti-PUP (Potentially Unwanted Program):
What does Potentially Unwanted Program mean? [136]
Best Free Spyware And Adware Remover [28]
AdwCleaner [137]
Junkware Removal Tool [138]
Bitdefender Adware Removal Tool [139]
Adware Removal Tool - www[DOT]techsupportall[DOT]com/adware-removal-tool/
Force Byte Detector [140]
Toolbar Cleaner [141]; review [142]
avast! Browser Cleanup [143]
Auslogics Browser Care [144]
Smart Toolbar Remover [145]
Anti-ransomware:
What Ransomware is and How to Deal with It [146]
How to Deal with the Ransomware Called CryptoLocker [147]
Ransomware: how to remove it, even when the computer does not boot? [148]
How to Remove Ransomware [149]
Removing 'Police-themed' Ransomware [150]
Kaspersky WindowsUnlocker [151]; Banner Removal [152]
Unlock codes [153]
HitmanPro.Kickstart [154] (feature of HitmanPro, which removes malware only during trial period)
id Ransomware [155]
Anti-rootkit:
Best Free Rootkit Scanner and Remover [156]
How to Remove a Rootkit from a Windows System [157]
Kaspersky TDSSKiller [158]
GMER [159]
GMER MBR rootkit detector [160]
aswMBR [161]
Malwarebytes Anti-Rootkit [162]
Sophos Anti-Rootkit [163]
VBA32 AntiRootkit [164]
Kernel Detective [165]
SpyDllRemover [166]
Trend Micro RootkitBuster [167]
Bitdefender Rootkit Remover [168]
SanityCheck [169]
McAfee Rootkit Remover [170]
RootRepeal [171]
Rootkit Unhooker [172]
NoVirusThanks Ring3 API Hook Scanner [173]
catchme [174]
Oshi Unhooker [175]
ESET Hidden File System Reader [176]
AntiSpy [177]
Getting rid of MBR Rootkit's (bootkit) [178]
NoVirusThanks Anti-Rootkit [179]
wincheck [180]
Packed Driver Detector [181]
ListParts [182]
PC Hunter [183]
PowerTool [184]
List of Anti-Rootkits [185]
15 AntiRootkits to Detect and Remove Malware that Uses Rootkit Technology [186]
13 top best free rootkit removal (anti-rootkit) programs [187]
Specialized applications:
Subsections follow.
1. Individual applications:
[188]RKill [189]
Detekt [190]
Remove Fake Antivirus [191]
RegAuditor [192]
RemoteDLL [193]
UnDLL [194]
SecureMybit DH Scan [195]
Simple Machine Protect [196]
2. Applications from anti-malware vendors:
Bitdefender [197]
Kaspersky: 1 [198]; 2 [199]
ESET [200]
Symantec [201]
AVG [202]
Quick Heal [203]
K7 [204]
G Data [205] (see Tools tab)
Trend Micro [206]
Avira [207]
McAfee [208]
Single file analysis:
Subsections follow.
1. Information:
How to Tell if a File is Malicious [209]
What Else Have You Just Downloaded? [210]
2. Online scanners that use signatures:
Subsections follow.
2.1. Information:
11 Free Online Virus Scanners [30] (with reviews)
2.2. One scanning engine:
Dr.Web Online Scanner [211]
FortiGuard Online Virus Scanner [212]
avast! Online scanner [213]
ThreatExpert Online File Scanner [214]
NANO Antivirus Online scanner [215]
Comodo File Verdict Service [216] ; Valkyrie Uploader [217]
2.3. Multiple scanning engines:
[218]VirusTotal [219] ; [220]VirusTotal Uploader [221]
VirusTotal Scanner [222]
PhrozenSoft VirusTotal Uploader [223]
VT Hash Check [224]
Jotti's malware scan [225] ; JottiQ [226]
Virscan [227]
Metascan Online [228]
Gary's Hood Online Virus Scanner [229]
Hyperball [230]
Crystal X [231]
[232] [233]Sigcheck [234]; SigcheckGUI [235]
3. Non-signature techniques:
Subsections follow.
3.1. Without executing the file:
[236]PeStudio [237]
PeSweep [238]
ExeScan [239]
Malware Analyzer [240]
Portable Executable Scanner [241]
[232]Sigcheck [234]; SigcheckGUI [235]
FileAlyzer [242]
Comodo File Verdict Service [216] ; Valkyrie Uploader [217]
Pescanner [243]
FileScanner [244]
[218]VirusTotal [219] (see other tabs) ; [220]VirusTotal Uploader [221]
Norton Power Eraser [51] (Advanced Options -> Reputation Scan)
Hyperball [230]
Peek [245] 
3.2. Online behavioral analysis:
ThreatExpert [246]
GFI sandbox [247]
Comodo Instant Malware Analysis [248]
Comodo File Verdict Service [216] ; Valkyrie Uploader [217]
Anubis [249]
Joe Sandbox [250]
Xandora [251]
ViCheck [252]
Payload Security [253]
Malwr [254]
Signature definition files:
Avast [255]
AVG [256]
Avira [257]
Bitdefender [258]
ClamWin [259]
Comodo [260]
Emsisoft [261]
F-Secure [262]
IKARUS [263]
K7 [264]
Kaspersky [265]
MalwareBytes [266]
McAfee [267]
Microsoft [268]
Nano [269]
Panda [270]
Quick Heal [271]
Sophos [272]
Spybot [273]
Superantispyware [274]
Symantec [275]
Trend Micro [276]
Twister [277]
VIPRE [278]
Zillya [279]
Read/Post comments [280]