Poker Night 2 Won't Load

I purchased the game through Steam. It downloaded, and states ready to play. Every time I click on the icon to play the game, it won't load. Waiting a little bit, and clicking on it again, I get an error stating that the game is already running. There is nothing in my task manager that states the game is running.

What is going on? I paid for a game that I can't even use?!?!?!
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