Installation Error

When i try 2 INSTALL Combat Arms it gives me an error saying "could not load Dll!". I ALREADY RAN IT COMPATABILITY MODE AND AS ADMIN BUT STILL NOTHING! Could any1 have an answer for this plz help!!!!I posted in the nexon forum 2.
PS: My LAPTOP is running VISTA and its HP and my video thingy is GeForce.

install it again

maybe the installer corrupted while you were downloading it
if installing it again doesnt work you should try re-downloading the installer