HijackThis

This handle tool will scan your registry and file settings on your computer and give you a detailed report and lets you choose what you want to remove. As some antivirus or malware scaners may find a useful tool like an ip scanner as bad. Select only what you want to remove.

IMPORTANT: HijackThis does not determine what is good or bad. Do not make any changes to your computer settings unless you are an expert computer user.

http://free.antivirus.com/hijackthis/