Need some help with my Gmod

When I join a online game on Garry’s mod or go in single player I am unable to load up the menu in game to spawn items in, I cant change my weapon but it says they are there and my physics gun is the only thing out and it doesn’t shoot the beam or anything?

[editline]10th February 2013[/editline]

I have uninstalled and re installed 3 times and is the same

(User was banned for this post ("wrong section" - postal))

Do you have any addons creating errors? Check your console.