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As stated above it could very well be a Hardware issue with failing Hardware which is nearly at Silicon Heaven but it could just as easily be a Bad Install of Windows which is corrupted and so messed up that your only option is to redo the install to a clean Disc.

Personally I would first be testing the Hardware with something like the Ultimate Boot CD which is a free product available here

majorgeeks.com/Ultimate_Boot_CD_d4981.html

Test things like the HDD, RAM and CPU to begin with but depending on which OS is involved and what Drivers where installed the problem could be anything.

Col