Computer is spyware free and virus free and runs great except the thing will not restart. I can shut it down using the Start menu, but restart will not work. It acts like it is going to restart, but hangs at a black screen with a blinking curser in the upper left hand corner. Once it gets there, I have no choice but to manually power it off and restart. This also happens after installing an update when it prompts to restart. Any ideas? Anything would be greatly appreciated!