OK I HOPE THIS HELPS...
FOLLOW THE LINK BELOW AND DOWNLOAD WINDOWS DEFENDER... AND ITS FREE... ITS PROVIDED BY MICROSOFT....
http://www.microsoft.com/athome/security/spyware/software/default.mspx
AND TRY RUNNING FULL SAFETY SCAN ALSO...
AND THE LINK FOR THAT IS BELOW:
http://onecare.live.com/site/en-us/default.htm
ITS ALSO PROVIDED BY MICROSOFT..
IF NOTHING HELPS... THEN JUST RESTORE UR COMPUTER...