You pay for it, I'll get it, until then my Intel whatzit will have to do!

I had this exact same problem in my game. I have a Dell Inspiron 1525 and the GM965 chipset driver on Dell's website is out of date but the one on the Intel website wouldnt install because of the certificate or whatever.
Anyway after poking around on various tech forums and whatever I managed to fix it.
I downloaded the driver from the Intel website, but the zipped version.
Unzipped it then in Device Manager, right clicked on the chipset and clicked update driver then browsed for the folder so did it manually.
When it asked what folder to look for the driver in, I chose the Graphics folder that was unzipped from the Intel driver package and it installed.
Checked my game and it fixed the problem! I am finally seeing fat and muscled sims!
Hope this helps someone else!