http://www.malwarebytes.org/
Probably need to install in safe mode.
Prolly told this story before, but not long ago my buddy caught a virus and asked me to get rid of it. I go over and there's a virus saying he did something illegal and has to send money. It tries to scare you by taking a pic with your webcam, so there was this pic of him all disheveled in the dark. It was so funny!