I had something similar happen with a faulty XFX Geforce card, running anything using DirectX9.0c would make it crash after 3-30 minutes, and anything using DirectX9 at all if not using a year-old driver. If you can borrow a friend's graphics card you could see if that's the problem. Otherwise, your computer might be running hot, you could try to remove the exterior case to improve ventilation and see if it makes any difference.
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