Request Request for this L4D Error

[watdaef]

1st of all.. I downloaded my L4D in STEAM

then I can't open it.... so what i did

I Go to C://Programfiles/Steam/steamapps/common/LeftForDead/Left 4 Deadexe

when i click leftfordead.exe it loads but only until the intro or movie trailer where they survive from the zombies..

after that error says

Cannot load library client

and instantly close.

what should I do?

[wasdfwasdf]

wait
the exe should be named Left4Dead.exe not leftfordead.exe
(common\left 4 dead\left4dead.exe)
I think your file is fake