My vista computer is having a bit of a problem. Anywhere between 2-5 minutes after the screen pops up, the computer freezes, but the mouse moves and the videos keep playing the sounds, but not the actual video. When I run the computer is running in safe mode, it won't freeze. I have run malwarebytes in this mode and found nothing, and avast won't even turn on. Even after doing a clean boot, I had to forcefully turn off the computer, and when the screen popped up, while it is not frozen, it won't run any programs, and task manager won't come up. Please help.