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Too late to edit my first post, seems like he's able to get into the GUI at least (you said he got into safe mode). If he can actually get into the GUI for a couple of secs than it's not windows causing it. Usually if it's a fucked up component in the OS it'll reboot BEFORE you get any GUI loaded. It could be a number of hardware problems causing the problem, or as barefootsies said a virus. Hardware problems, it could be a PSU issue, ram issue, or a motherboard issue. Easiest way to test to see if it's a virus vs. hardware is if you have a spare HD put it in the computer and reinstall a OS on it, and try to boot it up. If it's stable, then it probably was a virus. If it's not stable then it's a faulty component and you may have to test the computer one component at a time.
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