go to http://www.download.com/
and search for Spy Bot search and destroy, and another good one is Ad-Aware Se personal edition.....and guess wut...there free. scan you comp with those, and come back here, and tell us how it goes. Another thing would to start using Mozilla FireFox. Now that assuming that you have hi-speed intetnet, and are using Ie.
EDIT- you might wanna purchase McAfee virus scan, and fire wall plus, and that can be done off that web site.