I use a mac so don't need this, but I downloaded it for a friend who was almost at the point of being unable to use his computer due to malware. I ran it once and it was magic it dealt with all but one of his problems. The problem was XP antivirus which it appears is a really bad infection and needs careful handling. I have downloaded another product from Version Tracker to try and deal with this. I would highly recommend Norman Malware Cleaner to any PC user with an infected drive.