This is fixed now, but I would like to know if anyone else had this problem. I tried to install Life Support or GCombat or something of that sort, and after I checked back, I found all of my Garry's mod files deleted except for garrysmod/garrysmod/addons/[that addon name]. I fixed it, however by looking in the bin, and finding a copy of my garrysmod folder with everything in it, so I replaced the deleted one. I recently discovered that some addons don't work (Hoverboard, and Wire Mod's models are errors). Which, I'm trying to reinstall now. Edit: Hmm, I discovered I had two garrysmod folders, I guess I had an error in replacing my garry's mod files after the delete... odd, they're nearly the same, but one has more stuff then the other I think.