Preparing game to launch goes forever

Yeah, I’ve tried to play GMod after years of not playing, and it only shows me the “Preparing game to launch” window from steam, but doesn’t goes any further. I’ve already verified the files, no problems.

Computer specs(don’t know how this helps, but people seem to ask for them):

AMD Athlon 64 X2 3800+
nVidia GeForce 220GT 1024MB

Already tried the “-fullscreen” thing, nothing.

Any help would be appreciated.

Try update your Graphics Card Driver, DirectX, delete the game files (Steam/steamapps/<YourLogin>/garrysmod) if you have any e2 or adv duplicator files make backup before you delete, try delete ClientRegistry.blob.

If everything fails, You are f*cked!