Kenticus2

I bought the Arma 3 Beta via steam, only to discover that it crashed immediately at start up every time I attempt to play. The Arma 3 logo appears and states that the game is loading, but then the logo disappears and nothing happens. If I try a second time I receive a message from Steam stating: Failed to launch game (app already running). I have tried re installing the game and restarting my computer, but nothing works. What can I do to fix this? My 45$ Beta is currently unplayable.