Connectivety

I'm troubleshooting a problem for a customer of mine. Here is the problem - I've got a desktop pc with Windows ME PC connected to the Internet via USB Modem plus it also has a belkin wireless adaptor. I've also got a laptop running XP Home with built in wireless card.

I have got them working using the conventional wired network card but trying to connect these using the wireless networks cards seems to be more tricky the pc's cant see each other.

If you have any ideas - much appreciated