Tools that might help fix your infected PC?

Anti virus software (Completely free)
http://www.avast.com
http://free.avg.com AVG
http://www.free-av.com/ Avira AntiVir

Online anti virus software:
http://www.cloudantivirus.com/en/ Panda Cloud Anti-virus

Standalone scanner
http://vil.nai.com/vil/stinger/

AV and Anti-spyware?
Windows Defender http://www.microsoft.com/windows/products/winfamily/defender/default.mspx
Microsoft Security Essentials http://www.microsoft.com/Security_essentials/ "Microsoft Security Essentials provides real-time protection for your home PC that guards against viruses, spyware, and other malicious software."

Anti-spyware tools
http://www.emsisoft.com/en/software/free/ A-squared / Anti-Malware Free edition
http://www.download.com/Ad-Aware-2008/3000-8022_4-10045910.html?tag=lst-1&cdlPid=10844457 ad-aware
http://download.cnet.com/Spybot-Search-amp-Destroy/3000-8022_4-10122137.html Spybot

Lots more links and information here: http://www.moneysavingexpert.com/shopping/free-anti-virus-software

Symantec tells world that Windows is most secure OS

"According to Internet News, Symantec found that Windows had the fewest number of patches and the shortest average patch development time of the five operating systems it monitored in the last six months of 2006.

During this time more than 39 vulnerabilities were found in the operating system and Vole took an average of 21 days to fix them. While this is still more than last year it still knocked the spots off the competition." from the inquirer