try looking in the bios to see if you have a fan speed controller this might be set at too low a temperature. It could well be that the game requires so much power that it is getting very hot and the fan is doing its job by cooling it down and therefore protecting it. If the pc is running ok otherwise I would leave the bios update very much alone. You could open the case and see if the case has got a lot of dust and hair inside it. A good clean out never hurts anyway.