I seem to have fixed the problem by removing the back panel of the laptop, exposing the CPU heatsink, and running a 120mm fan under it to cool it. Not the best fix in the world, but it lets me play Just Cause 2 a little while longer. Thanks for the info.
I want to try this 120mm fan idea. I know little to nothing about this. Is there a place to plug the fan in so that it has power and runs? Any help on how you did it would be fantastic.