My guess would be that a serious error occurred. This is usually the result of corrupted drivers or driver conflicts, but could be nearly anything. Given the lack of information, I'd suggest backing up anything you want to keep and then staring over with a fresh install of Windows (XP is my guess, from the look of it.)
Or, it could be the result of overheating. Open the machine up and check that all fans are running (when powered up) and clean the dust bunnies out of everything.
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