If you are using One Care please contact support for help with malware removal. How to reach support -
http://social.microsoft.com/Forums/en-US/onecareinstallandactivate/thread/30400b52-7f26-4ba0-bc18-17e305329d90 If you are not using One Care you are off topic in this forum but you can get help here -
https://www.microsoft.com/protect/support/default.mspx
Jim - MVP Windows Live - Forum Moderator - Live One Care - Live Mesh - Microsoft Security Essentials