just a heads up i have something like this on my desktop (its really old so i dont care lol) but i kept getting the virus thing and it kept asking me to scan which just made it worse... i tried a system restore and i cant even connect to the internet so i wouldnt try that lol....
one thing that might work is wiping your hard drive and reinstalling windows which can be a pain if you have a lot of files because they could be infected also