Do you have a dual graphic system ?
I see in your DxDiag something about NVIDIA GeForce GT 650M but the graphic report only contains a chip (which is below specs).
If that NVIDIA GeForce GT 650M is a graphic card, make sure your system is switched to using it prior to starting the game.
Yes I have the Nvidia optimus. So I have a low performance chip and a high performance card. When I did the dx I was closed out of the game and it was back to low performance. Its set to automatic and should switch over to the card and has been with my much more demanding games. So that shouldnt be the issue.
I know some people with switchable cards have been having issues but I can't really remember what they did. Did you double check if indeed the powerful one is used ?
The game is also notorious for having high frame rates so on powerful cards, if you don't limit them i can lead to problems as well. Try checking on them with the fps on cheat. IF they are over 80, you need to limit them either by using a fps limiter program (there's one especially for the Sims) or by setting the vsync on your nvidia settings.
Some more tips on crashes and lags are here:
http://answers.ea.com/t5/The-Sims-3/FAQ-Game-Grashes-CTD/td-p/656/jump-to/first-unread-message
http://answers.ea.com/t5/The-Sims-3/FAQ-Lags-amp-Freezes/td-p/646/jump-to/first-unread-message
