Games make the CPU work very hard and therefore it heats up. The temps you are suggesting are increadibly high. I hope they are not in centigrade.
Your cooler is just reacting to the hot CPU in the way it was designed to. If it is too noisey whehn you play game you may need to consider buying a quieter cooling system such as a Zalman.
Before that, when you machine is off and cooled down. remove your CPU cooler and check if the cooler has heat transfer paste on it. Also check there isn't too much. Check the plastic cover is off the bottom of the cooler (don't laugh I've seen it happen).