I just bought Fallout 3 Game of the Year on Steam today but I can only run it for small periods of time. Sometimes its for an hour and sometimes its for seconds but then suddenly it freezes up and it reads *not responding*. I have tried tuning down the settings but that doesn't seem to be the problem. I can run far more enhanced games on my PC so I cant see how that could be the problem either. Is this happening to anyone else? Any suggestions on what I should do?