My computer boots fine until it hits the blue screen where you choose to log on (Admin or other users) I'll try logging in, but soon after, the whole computer reboots and it doesn't seem to be able to access the desktop menu. I think I may have a virus. I tried booting it in safemode and other ways, but it doesn't work. Suggestions on how to fix it? Anyone with similar experience? Or is my hard drive no good? thanks