Left 4 dead 2

hello
Im trying to instal game and when i get in game and try to start play this is what i get can someone pls help me ?

if you cant see imag here is link
http://www.stooorage.com/show/2686/11088506_untitled.jpg
Answer #1
re-install the game , there seems to be a missing file …
Answer #2
Exactly, just reinstall and it should fix problem.