Hi,try Ad-aware 6 or Spy-bot Search and Destroy to clean your system up they are both free to use as well.I have recently changed my Anti-virus to Titanium Panda Antivirus 2004 which is excellent as well.here\'s the links.
http://www.lavasoft.de/
http://www.safer-networking.org/index.php?lang=en&page=download
http://service.pandasoftware.com/rolv3/allen.html?parametrosproducto=
Panda anti-virus is not free though,my buddy at MNS Computers keeps them in stock at Blyth and are very cheap