Crashing when running GMOD on DirectX 90 mode?

My computer specs can run Garry’s Mod
My computer supports up to DirectX 10
I can run CSS,TF2,and Portal on DirectX 9

EDIT: Oh and, if I run DirectX 8/8.1 then I will crash when rapid particles are activated anywhere.

What happens:

  1. I load Gmod
  2. I go to the loading screen
  3. After 3-5 seconds of viewing the loading screen, I crash.

“hl2.exe has stopped working…”

PC specs?