When i play "Left 4 Dead" or "Alliance of Valiant Arms" my computer just shuts down after 10 minutes. I have made several attempts to fix this. A few days ago, it said that my NVIDIA thing is corrupted or something. Since both "Left 4 Dead" and "Alliance of Valiant Arms" both use this NVIDIA thing,i tried deleting it and redownloading it, which my computer already did for me. However, when i open my computer, it always ask me if i wanted to finish installing NVIDIA. I always click yes, but it still does it. My computer also says that the NVIDIA download is done. I can still play those games, but they still shut down my computer after 10 minutes. Help?