I just bought an Airport Extreme. I have two desktops (wired) and a laptop (wireless). They all can connect to the internet fine (wired and wirelessly respectively). But there is no network (file sharing, itunes sharing, etc.) I was under the impression that the difference between the AP extreme and AP express was that the extreme is also a router (capable of creating a network). I have been looking for a way to set this up all week. Am I an idiot and simply can't find the right setting or is the Airport extreme not capable of this?