When I start GMOD it crashes before the menu pops up. I Vista 64 bit Home. I have integrated Intel chip set. It’s a laptop BTW.
It was a bug that went around a week or two ago. it happened when TF2 got an update. Heres a link to how i got mine fixed: http://www.facepunch.com/showthread.php?t=772126&page=2
Or heres the solution:
hope that helped