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Virustotal is a service that analyzes suspicious files and URLs and facilitates the quick detection of viruses, worms, trojans, and all kinds of malware detected by antivirus engines.

The CA Online Malware Scanner scans your computer for viruses and spyware. The scanner is capable of detecting malware threats from within your web browser. You may use the scanner free of charge.

Easy to use FREE curing utility to clean your computer infected with viruses and various unwanted codes by the Dr.Web Anti-virus updated once or several times an hour.

What is Dr.Web CureIt!?

Malicious software called Bots can secretly take control of computers and make them participate in networks known as “Botnets.” These networks can harness massive computing power and Internet band

BitDefender offers free scanners for these viruses:

Backdoor.IRC.Sticy.A (.exe)
Backdoor.K0wbot.1.2 / 1.3.A / 1.3.B (.exe)
BackDoor.Rebbew (A,B,C,D) (.exe)
Backdoor.Sticy.B (.exe)

TrendMicro HijackThis is a free utility which quickly scans your Windows computer to find settings that may have been changed by spyware, malware or other unwanted programs.

Windows Defender is a free program that helps protect your computer against pop-ups, slow performance, and security threats caused by spyware and other unwanted software.

The Microsoft Windows Malicious Software Removal Tool checks computers running Windows Vista, Windows XP, Windows 2000, and Windows Server 2003 for infections by specific, prevalent malicious software

Trojan horses are a huge security threat.

SpyCatcher™ Express provides powerful, immediate protection from known & unknown spyware as well as rootkits.

Spyware Scanner uses ActiveX technology to scan your computer for spyware, adware and other malware quickly and effectively.

Free Spyware Scan available from We

ESET's Online Scanner features these powerful security benefits for your PC — all free!

avast! Virus Cleaner is available free for every user. This tool will help you remove selected worm infections from your computer.

Free virus & worm removal tool

Scan Your Computer With the F-Secure Online Virus Scanner

F-Secure Online Virus Scanner is a free service. Use it to find out if your computer is infected and disinfect your computer if needed.

Stinger is a stand-alone utility used to detect and remove specific viruses.

Symantec Security Response has developed free virus removal tools to automatically conduct what would often amount to tedious manual virus removal tasks.

FREE on-demand service scans your PC for viruses, spyware, and more.

The eTrust PestScan shows you what spyware is on your system. It will not remove or modify any files.

Test your computer's exposure to online security threats and learn how to make your computer more secure.
There are two online tools:
Security Scan
Antivirus Scan