URGENT L4D content help

i just downloaded l4d content. Everytime I try to load a survivor, the game crashes on me. If I do manage to, the model goes CRAZY, like it has been inflated/deflated big time.

can you guys help?

Where did you get the model from? Perhaps the file was corrupt. Re-extract the files from the archive from which they came. If the problem still occurs, find a different pack or re-download it.

i got it from here at facepunch, ill try another pack