Spybot Search & Destroy

This tool is one of my favorite and I generally do not even use the full scanning feature. I recommend using the Immunize feature of this program. Also, go to Mode > Advanced Mode, and choose System Internals on the left-hand side. I would not recommend the TeaTimer as it seems to interfere way too much. You may want to Start your computer in Safe Mode before a scan.

Download this Free software at the developer's site.