I have one question: have you removed the winsupdater folder which is a hidden file on your c drive under program files?
Yup windowsupdator.exe can be infected with many virus very common ones are w32.spybot.worm thats the one I had, Now when you shut down your computer does in open op a little thing that says shutting down winsupdater.exe click here to end now. If it does you have the worm virus. I picked it up using nortin, However I would assume that it would work with macafre
