Not one bit of useful information here...
"Not up to specs...", "correct power supply...", "integrated video card..." ??? What a load of horse dung !!!
Sims 3 crashes on many different systems, from low to high end. Only thing you can try is to update your graphics card drivers until Electronic Arts releases a patch that fixes the problem. It seems to crash on Vista more often than XP, and with NVidia graphics cards more often than others. I had the problem with XP and an older ATI Radeon graphics card UNTIL the first patch, from then on it was okay. My friend has the problem now, AFTER the patch 1.6, and also after installing the expansion, with Vista and a new NVidia graphics card. So I guess there must be something wrong with the game, not with the systems on which it is running. Hope EA will (and wants to) fix it.