[vonofterdingen]

There is a known problem caused by the perfect storm of heat, Vista, and nVidia drivers. I have heard that it will be fixed with Vista SP3 (I assume it is already handled with Win 7). If that is your configuration, I have not seen the issue since I started using the 186.xx driver (or above) and set my fan to 100% when running the game. You can use rivatuner or nVidia's NTune to provide fan adjustment.