GMOD is crashing my computer.

Well, when I open the game through steam, the loading screen comes up, it idles for a few, and it freezes.
I can’t do control-alt-delete, I cant alt-tab.
I’ve let it sit there attempting to load for about 15 minutes and it never works.

I have re-installed it and everything.

Problem: Bad Computer
Solution: Get a better Computer

Ha, I knew I’d get a reply like that, so here are the specs.

Core i7 920 @ 2.6GHz
GeForce GTS 250 1GB VRAM

Are your video card drivers up to date? Do you have any command line options specified for Garry’s mod?

what he said ^ and
verified game cache?