I've seen something like this before, and Spybot Search & Destroy and Adaware fixed it
Download Spybot here, scan your PC and get rid of the bad stuff
http://fileforum.betanews.com/downlo...y/1043809773/1
Download Adaware here, scan your PC, and get rid of the bad stuff
http://dw.com.com/redir?edId=3&siteI...%3Ddl-ad-aware
Two very straightforward programs - run them and then see if that fixes it!