Crashes without Explanation at Loadin Screen

OK, so i bought Gmod last night and at first it got some stupid background image issue, fixed that, but now when it gets to the loading screen with the player and the tool gun, its there for maybe 1-2 seconds before the program closes without explanation. No error message or anything.

I dont know what to do.

I’ve tried changing the start up properties to

-dxlevel 70
-dxlevel 71

and

dxlevel 80
dxlevel 81

I dont know whats wrong i dont want this to be a waste of my money.

I’ve even reinstalled and re-verified my cache

Steam Profile: http://steamcommunity.com/profiles/76561198009919295