Try AVG Free Edition, and especially SpyBot S&D (Search and Destroy). I was having the same problem recently, and as long as you keep SpyBot updated, you shouldn't have any problems after installing it and running a check. It also lets you immunize your files, and recovery after changes to your system.
I was considering wiping mine, too, until someone shoved that program at me. It's also free.
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I was considering wiping mine, too, until someone shoved that program at me. It's also free.