Laptop Overheating Problem

Whenever I run a full-screen program, such as Diablo II, or Marrowwind, my laptop just shuts down after 2-3 minutes of play (I strongly believe it is due to overheating). I had this problem inspected by toshiba when it was under warranty, and they improved it, but now my ex-girlfriend chucked it off the desk, and I believe this did something to the cooling system. Does anyone have any idea what I could do to keep it from overheating? I really don't want to spend money on it.

How ya doing, buddy?

Yes, it does that exactly, the fans rev up when i run something like a full screen program. And then it seems as though it shuts down after 2-4 minutes of running the game. I blew it all out with a CO2 tank, im gonna see if that works.

There's nowhere I can't reach.

Nothing happens when im doing normal stuff unless i do not put it on a hard surface and thigns block the fans.

This thing is sticky, and I don't like it. I don't appreciate it.