GMod Crashing Help

When I launch my GMod it says:

“Preparing to launch Garry’s Mod”

Then it loads up in taskbar for 2 seconds then disappears then doesn’t load up the game at all.

[editline]8th July 2014[/editline]

I’ve fixed it, I recently restored my PC, and all it was is that I didn’t install my Graphics Card.

Locked & Done