Any ideas where this comes from? At least once a month I need to remove this (or the Antivirus 2010 virus) from a client's computer. The owner of the store spends all day looking at porn, but doesn't know enough to keep himself from getting infected. I have them set up with Microsoft Security Essentials, but that seems to be ineffective against this breed of malware. Any tips on preventing it from coming back? Thanks for the great post, btw.