Terry,
I was having that problem also and tightening the loose nut seems to work....uh, nope, just got another one. Dang It !!! I might need a bigger wrench. Thanks Anyway
Seriously :
Michael,
If what Terry advised doesnt work, try downloading and running Windows Defender from Microsoft's website. AdWare and SpyWare could also be the culprit and there are several free downloads on the net. BTW, check your firewall setting also. If none of this works, video tape yourself destroying your computer with a sledge hammer or what not, send it to You Tube, and maybe you can make enough $ to get yourself another.
Take Care