I never use custom skins, TF2 is best without any custom skins.
I have no idea, there must be a better way than just reinstalling, I guess.
Always make back-ups before you start using skins.
Well, some people replace the default walls by semi-transparent textures, so they can see trough them. Which is gay and for people who don't even bother trying to get better.
If they're of a higher resolution than the default ones, it will only lag your computer.
I just deleted all my folders and they installed by them self xD Now i only need to find my sniper rifle one. Also my ping dropped on a server from 160 too 60 :O
Macrador, all you have to do to get the original skins of the characters back is to just delete the models and weapon folder in the materials folder in the tf folder. (what a mouthful. lol)