The Sims 3 Graphics Issue

Your system only has an integrated Intel graphics chip, not a dedicated card (Nvidia or AMD). I'm afraid there isn't much that can be done on integrated other than keeping the graphics settings in Game Options on the low end and avoid using the more demanding EPs -- those are Pets, Seasons, IP, and ITF.

But let's also call in an expert on different GPU setups to see if I've missed something or she has anything to add. You can also get her attention and that of the others there on EA's Answers HQ board for TS3.
@puzzlezaddict