Here's my setup: IMac running both OSX 10.5.4 and Windows XP using Bootcamp. Mac side connects to Internet via Airport extreme wirelessly. Cannot get the Windows XP side to connect to the Internet. Tried native Windows networking setup and also, airport utility. The airport utility doesn't even see the airport extreme base station? The airport extreme is setup as a secure network. Windows XP sees it, connects, cannot find IP address. Tried the repair feature without any luck. Both sides were originally connected via ethernet cable, but had some trouble recently, and the Apple tech had me setup the Mac side wirelessly. Never gave a thought to the Windows side until I tried to connect today.