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I split off your thread because this isn't a patch problem. Your graphics aren't up for handling the game. Sony is the king of crapware though so there are some things you can do to clean up your machine, but it's still not recommend that you try to play the game on that machine.
Have a read through these guides:
http://modthesims.info/wiki.php?tit...nboard_Graphics
http://modthesims.info/wiki.php?tit...em_Requirements
The onboard guide was written for TS2 but most everything also applies to TS3. Go through the suggestions under the "Optimize Your Windows OS" and your computer will run better overall, but it won't address the weak graphics problem.
I also want to check for overheating. Download and run this program:
http://www.cpuid.com/hwmonitor.php Leave it running –while- you play the game, and it will automatically record the maximum temperatures. Ideally you want to play a minimum of 20minutes. I'd say since you don't have problems for close to an hour, play that long. If your game is crashing then you can play until it crashes. If your whole computer is crashing you'd need to exit out before it shuts down or you'll lose the info. Screencap the results (print screen and paste into photo program) and post them here.