I'm a Network Admin by day and I've dealt with this quite a few times over my career. Go to http://www.bleepingcomputer.com/download/combofix/dl/12/ and download combofix, save it to your desktop and let it run. Any prompt that it has say either "Yes" or "Ok". Once it's finished it will have a log of what malicious items it removed under the "Other Deletions" section.