Crashes on start

My Garry’s Mod used to work fine but after break from it I tried to start playing again but now it just crashes on startup. I have tried deleting all the Gmod folders and reinstalling but still get this error:

[editline]15th March 2014[/editline]

Ok wow I found the solution for me here :
If you use Gygabite video card just close OC GURU program.