Go to this website and follow the instructions for downloading and running a program called Hijack this. DO NOT attempt to do any deleting yourself. Post your scan on the site, and you are virtually certain to get your problem resolved. There are several experts on the site who are geniuses at sorting out these problems. Several of them also visit here. The problem here is that due to restrictions you have to split your scan into two halves for posting, whereas on Windows forum you can post it all in one go.