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Well, because only applications crash (particularly games), it sounds like a video card issue. It could be, as said, an overheating problem, but it also could be physical damage to the card. Do you have an older card you can try? (Or a PC you can pull one out of to test)
Given that the automatic install of the drivers didn't detect the correct hardware, I would guess it's either a physical defect with your current card OR a problem with Windows. If you don't have a card to try, try updating Windows, running virus scans, etc.
Good luck.
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