getting past the loading screen on portal 2

Hi there!

I was attempting today to test this software using my copy of portal 2 to see how it ran. The game appears to load, (although, slowly) but i gets stuck as soon as the loading screen for the main menu appears. Im hoping someone could point me in the right direction if ive done something wrong, or if the game simply isnt run-able yet (the game was not listed at all under compatibility)

Thanks.

Edit: Never mind. I just missed it before. Too bad.