It sounds like you have hardware issues. try removing all but the esential components, and check for chared parts, or blown capacitors. If the screen just freezes, but the computer continues to work, i.e. blinking LEDs, keyboard lights change when toggled, hard drive sounds, chances are your video card is shot.
Sounds like you need to re-format drive and install.
I have seen something on this at MS Technet, but don't recall specifics. Something about Windows getting corrupted, and some files to replace to try to repair.
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