Server downloads don't work

Hello, I just build a new computer with an Intel Core i5-2500k CPU, Asus p8p67-m Pro M/B, and EVGA GeForce GTS 450 graphics card. I completely wiped the HDD out of my old computer and put it in this. I have Steam and all my games installed on an external drive. But the problem I have is when I’m in game stuff such as who is talking, pointshop, voting for gamemode, F1 menu for switching teams, and everything that isn’t the game itself does not show up. Also i get errors saying that the guns (for TTT) cannot be displayed, and my console is flooded with errors saying that there is no GameMode. Also the models/ maps will not download from the server. I have tried Right clicking clearing local content then re-installing, and also Deleting the whole garry’s mod folder with no luck. I don’t know what to do next.

The error seemed to fix its self but now I cannot see fire. With this error in console. Attempting to create unknown particle system ‘env_fire small’