Hi Shylock!
I seem to get the blame for everything around here! ;-)
Something nasty seems to have found its way onto your PC.
First, run a full scan with your antivirus software. Then run a scan with Adaware and/or Spybot Search & Destroy:
http://lavasoft.com/products/ad_aware_free.php
http://www.safer-networking.org/en/spybotsd/in dex.html
If those applications don't do the trick, try this:
1. Download SmitfraudFix.exe
http://siri.geekstogo.com/SmitfraudFix.php
2. Turn off System Restore. Instructions here:
http://support.microsoft.com/kb/310405
3. Run SmitfraudFix (following the instructions in the link).
4. Turn on System Restore.
Chris