Google a program called hijackthis. Install it and do a scan. then post it to the virus/spyware section in TF, but do not try to clean up the scan yourself. Let the experts help you the first time. You can post your log here:
Then download and install the following: Ad-aware, spybot search and dertroy and spywareblaster. The first 2 will get rid of stuff the second one keeps it from coming back. Then after all that do a virus update and complete system scan/clean. Wait for your log to be checked over and given your reply on what to do from there.