Crashes, and settings not saved

Everytime i try to play Gmod multiplayer, my game crashes. its only been happening since i got this Vmod collection, and now i removed that, i reinstalled the game, ive done everything i know of (except cleaning the registry, but i dont think that would help). also my none of my video settings save, so when ever i play singleplayer, i have to fix the video settings

Try verifying.

Did you try cleaning addons…

What is your specs by the way?