Wireles - XP with Vista

Hi

Can anyone help me configure a wireless network with XP and Vista. It
does not use any access points, but it is a permanent ad-hoc network.

The computers connect to the network successfully, but they don't see
one another. File sharing is enabled on both computers.

One is running XP Home Service Pack 2, and the other is running
Windows Vista Home Premium Service pack 1.

I also have a LAN cable, but I cannot get Vista to run the network
connection wizard.

Please Help!

H@mst3r