Sims 3 keeps crashing?

Maybe you're computer just can't handle all these files (2 games) ; btw upgrading to windows 7 doesn't necessarly solve the problem ,I had the same problem recently I had vista and when i've upgraded to win. 7 nothing changed It depends on the VGA and RAM of your computer also as for HDD (Hard Disk Drive : where all files on your computer are saved) unless you've got a powerful computer..