Hello,
You have a slightly weaker processor, which has integrated graphics - this is probably the cause of your crashing, as the laptop is probably overheating. The Sims 3 Pets is quite a demanding expansion pack, and therefore would push your system pretty hard.
I would suggest lowering your in-game graphics settings to low, and update your AMD graphics driver, which can be found here.
I hope this helps and keep simming,
Cody
