Problem With Models.

So, I’ve been having some problem with a few models not working: Props from props_c17 and or ‘construction’; “door01_left.mdl”, “door03_left.mdl”, “clock02.png”. It wouldn’t be a big problem, except I play DarkRP, quite a lot, and one of those models are the models for the default doors. Even the .png Spawn icons is missing. I’m trying to do this so I don’t have to download my whole Garry’s Mod again. Please, any help will be appreciated.