Learn your way around the effective freeware system diagnostic app, Trend Micro HijackThis, which gives you tools to help fight off hidden intruders.
Use these tricks to make Hijack This show you only the bad stuff.
Updated version of HijackThis and a new Trend Micro safe-browsing tool are due next week.
Use HijackThis to make sure you've deleted a malicious file for good.
Use HijackThis to find malware hiding in the alternate data stream.