My computer can't run this game
Also if you're using Vista, you can run the game with "disable desktop composition" (or something similar, in the shortcut properties).
AS is an updated version of a UT2004 mod which was released before L4D even came out (hell, it might've been released before L4D was announced, I can't be bothered to check). The team who made it is the same team behind the original -- Valve hired them a la Portal & dudes what made Narbacular Drop.
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