XBOX 360 and VIsta Internet COnnection Sharing

Ok, so with Windows Media Center I have my Computer hooked up via wireless
and and the SBOX 360 connected directly to my ethernet port via a crossover
cable...All I had to do was setup a network with XP Media Center and say
"This computer connects directly to the internet, other computers connect
through this computer" and boom XBOX Live connects with no issues...I cannot
use the wireless adapter with the 360 because of where the router is, it will
not work

....anyway so why can't i find the option to so that with Vista? I've been
playing around for hours with no luck....any adeas? Bridging the connections
causes IP conflicts...

Thanks
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Vista Beta 2
XBOX 360