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My Computer Is freezing While Playing 'Portal 2'!

Hello everyone, I recently downloaded 'Portal 2' from Steam. But I am having a problem, my computer is continuously freezing while playing this game. Can anyone tell me what could be the problem behind this? Any kind of suggestion will be highly appreciated.

Prior to posting here, I searched on Google and found articles like this one. I was able to resolve the issue by updating the device driver as advised by the top three solutions. Now I have no issues playing the game.