I had the same problem.
It is relatively easy to network your XP laptop and ME desktop together to share files and printer etc., but if you want to share a broadband internet connection rhen I suggest you buy a router.
First, setup your laptop and produce a Floppy disc for installing sharing on your ME machine.
(you can't produce a floppy disc on the ME machine which will work on XP).
You will need ethernet cards in both laptop and desktop.
If you are connecting without a router, you need cross over cables. If using a router, ordinary cables.Don't bother with the "sharing or networking wizard " on the ME machine, just run the floppy produced from your laptop.