melvantol

I have a problem with the sims 2; When I start the game everything is oke, but after a while of playing (sometimes 5 seconds, other times 20 minutes) the game freezes, after a few seconds the mouse dissapears and even ctrl+alt+del doesn't do anything, the only solution is cutting the power off. The error message says that the problem is Radeon IGP 320M, so now my question is, does anyone know how to fix the problem? Should I download some sort of newer version? Or is something else the problem?