Another option is Spybot Search and Destroy from
http://www.spybot.info/en/index.html
Run it in advanced mode. Let it run it's course THEN go into the tools section and clean out any BHOs or Active X componants that you find that aren't marked as safe by spybot. Then check Browser pages and make sure they aren't pointing you off to spybot land. Once that's done, look at System Startup and uncheck anything that looks suspicous.