Gmod keeps crashing, at random

Okay so … I’m getting the ‘‘HL2.exe. has stopped working’’ error, constantly. I’m just playing in single player
and it keeps poping up, and the game crashes… all.the.time.
I’ve been veryfing the game cache, I’ve disabled addons in order to rule out wich one of them might be causing this.
I’ve re-installed the game, and I’ve been trying the ‘’-dxlevel 81’’ thingy in the console to make it run more fluently.
I’m all out of ideas … and as far as I’ve seen on forums, nobody else seems to have this problem, exept for multiplayer errors.

If anyone have any ideas, please share …