Update your antivirus to the latest definitions, reboot into safemode and then run a full system scan. If you find a virus delete it. If its been out for two months, chances are norton has a fix for it (they have surely been able to steal McAfee and AVGs definitions in that amount of time )

if that doesnt work than download hijackthis and copy the log here, but PLEASE do the full system scan IN SAFEMODE first.