After a visit to a web site, either a virus or spyware has taken over my computer. My home page, which I had set to Google, has been replaced by some ******* search page. I change it back to Google, but it just changes back to this same page. When I try to run Ad Aware 6, the program closes by itself as soon as it opens. Same thing if I try to go to a web site that has spyware killing programs on it, it just closes the browser down. Virus? Spyware? HELP!