I had this happen to me a couple of times when the sim was more unstable (quite a few patches back) and i use a different card (Ati 4870 1GB).
I don't know what fixed it (driver update or game patch) but i have never seen it since. In other words, it's not necessary that your card is bad.
Just as a precaution, open your documents folder and navigate to the 1c softclub subfolder. In there you'll find the game's shader cache (the patch is documents\1c softclub\cache). Delete everything in the cache folder and launch the game again.
This will force the game to rebuild the shader cache from scratch (it will take a bit longer to load into the menus as it rebuilds it), which might solve your problem.
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