Wireless Router - Linksys WRT54G v 1.1
Problem laptop - Inspiron 1150 w/ Windows XP Home
Wireless Card - Dell Wireless WLAN 1350 Mini PC Card

The wireless network will work fine (1-4 other computers online usually, 1 wired, the rest wireless) until this laptop has it's wireless card enabled. Once this card is enabled, all other wireless connectivity to the network gets hosed.

When the problem laptop is plugged into the router via a cable, all is good too and it and the rest of the computers work fine and can connect wirelessly. It's only when the wireless card is enabled on the problem laptop. It doesn't even have to be attempting to connect to the network, only enabled and searching for networks.

Any ideas?