Malwarebytes Anti-Malware, Super Anti-Spyware, Prevx3.0, CCleaner, EasyCleaner, AVG Free, Spybot Search and Destroy, and Trojan Hunter all work for me when I'm not having problems.
You might need a USB Flash Drive if your computer won't let you visit the sites you need too. Here are all the links for the sites.
http://www.safer-networking.org/en/download/index.html --- (Spybot)
http://www.misec.net/ --- (Trojan Hunter)
http://personal.inet.fi/business/toniarts/ecleane.htm ---- (Easy Cleaner)
If your a comcast customer you get McAfee for free at ...
or final resort is Kaspersky
Hope that helps :)