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
8GB RAM
1TB HDD
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?