XP Pro laptop cannot find Vista wireless network created on laptop

I've created a wireless network on my laptop running Vista Business. It
shows it's waiting for computers to connect.

On the laptop running XP Pro I've set up the SSID and keycode in the list of
preferred networks.

The Workgroup names match, and the firewalls on both laptops allow the
other's IP addresses through.

When I go to search for available wireless networks on the XP laptop it
can't find any.

It can find my wireless network router but not the wireless network created
on the laptop running Vista Business.

Please help!
Thanks