Once I did list of free tools You may use to cleanup Your computer without payment.
Looks like it time to renew – for me and my guys to use, and to all to use for Your purposes.
Free Antivirus on-demand scanners:
CureIT (DrWeb project)
http://www.freedrweb.com/download+cureit/gr/
CureIT 7 beta
http://www.freedrweb.com/download+cureit+free/beta/
TrenDMicro free cleanup tool:
http://housecall.trendmicro.com/
All other free tools of TrendMicro (incl HijackThis):
http://free.antivirus.com/clean-up-tools/
Symantec Removal Tools:
Outdated, but in case You need it:
http://www.symantec.com/business/security_response/removaltools.jsp
AVZ
http://www.z-oleg.com/secur/avz/download.php
Kaspersky Removal Tool:
http://www.kaspersky.com/antivirus-removal-tool-register
Rootkit eliminator (BlackLight):
http://www.f-secure.com/en_EMEA/security/security-lab/tools-and-services/blacklight/index.html
Avast offline scanner:
http://files.avast.com/files/eng/aswclnr.exe
F-Secure offline scanner:
http://download.f-secure.com/estore/fseasyclean.exe
Microsoft Safety Scanner:
http://www.microsoft.com/security/scanner/en-us/default.aspx
Sophos Virus removal:
http://www.sophos.com/en-us/products/free-tools/virus-removal-tool.aspx
Antimalware tools:
Malwarebytes:
http://www.malwarebytes.org/
Combofix:
http://www.bleepingcomputer.com/combofix/how-to-use-combofix
Spybot:
http://www.spybot.info/en/mirrors/index.html
Microsoft Windows Malicious Software Removal Tool:
http://www.microsoft.com/downloads/details.aspx?FamilyId=AD724AE0-E72D-4F54-9AB3-75B8EB148356&displaylang=en
Comodo Cleaning Essentials (malware cleanup and process )
https://www.comodo.com/business-security/network-protection/cleaning_essentials.php
Emsisoft Emergency Kit:
https://www.emsisoft.com/en/software/eek/
Online Scanners
Symantec:
http://security.symantec.com/sscv6/WelcomePage.asp
McAfee:
http://home.mcafee.com/Downloads/FreeScanDownload.aspx?affid=0
BitDefender
http://www.bitdefender.com/scanner/online/free.html
Fast QuickScan (BitDefender Memory scan tool)
http://quickscan.bitdefender.com/
Panda:
http://www.pandasecurity.com/activescan/index/
F-Secure:
http://www.f-secure.com/en_EMEA/security/security-lab/tools-and-services/online-scanner/
CA Scanner:
http://cainternetsecurity.net/entscanner/
Rising AV:
http://www.rising-global.com/products/online-scanner-intro.html
Online File analysers:
http://www.virustotal.com/
Free AV solutions:
AV: Bitdefender Free
http://download.bitdefender.com/windows/installer/en/bitdefender_free.exe
AVG:
http://free.avg.com/us-en/download-free-antivirus
Rising
http://www.rising-global.com/Download/Rising-Free-Utilities/Rising-Free-Antivirus.html
Avira
https://www.avira.com/en/download-start/product/avira-free-antivirus
Microsoft Security Essentials
http://windows.microsoft.com/en-US/windows/products/security-essentials
URL Analysers:
Symantec: http://safeweb.norton.com
URLVoid (multiple engines): http://www.urlvoid.com/
DrWEB online check: http://online.drweb.com/?url=1
Useful tools:
HiJackThis
http://sourceforge.net/projects/hjt/
Process Explorer by Mark Russinovich
http://technet.microsoft.com/en-us/sysinternals/bb896653.aspx
AntiRootkit TDSSKiller by Kaspersky
http://support.kaspersky.com/downloads/utils/tdsskiller.exe
Updated 23.07.2012
Special thx for updates 0xerror http://www.scoop.it/t/h4x0r5