it might be a memory problem you should try taking out the memory then putting it back in. i also had a problem like that and it was because my powersupply ran out so i would get your computer it person or if you know how to do t yourself check the powersupply.
And if your computer stays on long enough i would clean it up do a spyware and virus scan, defrag your hard drive, remove any obselete programs.
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