Portal demo isnt loading

[Hangie]

Ok, heres the deal. I wanted to try the demo for portal and was thinking of buying crossover since I only have macs ( my dad refuses to buy anything else). I downloaded crossover, downloaded steam, and downloaded the portal demo off of steam. So after it downloads I hit "Launch"
So I see the valve logo and get all excited and crap, then it goes to a loading screen. I wait for 30 minutes and it still hasnt loaded...anyone have any suggestions?