|What is your video card ?|
The Nvidia 200 series cards have a problem
in Sims 3 and some other games.
My nvidia 285 card would crash my comp
after 2-5 min. The only way I could make it
work was to install the 190.XXX video drivers.
Also if your system is home built then you may
not have enough power supply to run it....
Most new good video cards need 600W + PSU
PS. I liked Sims 2 better ;-)