Switching to a new wireless card ==> no connection

Hi,

I have a wireless network with 2 laptops running windows connecting to
a linux PC. Everything is working fine. Now I would like to add
another laptop running linux to the network. I would like to use the
wireless card from my windows 98 laptop in my new linux laptop (the
new card I have is not supported in linux). When I try to install the
new card in the windows 98 laptop, I get a 100% signal but no
connection (can't ping between it and linux PC). I am using the exact
same settings from before, the routing tables are exactly the same.
Also, the old wireless card is not connecting from the new linux
laptop to the linux server. It's as if that card has become tied to
the windows laptop. Please help if you have any ideas. Thanks in
advance.