Wanadoo Livebox networking query

I have two PCs one with XP and the other with 98SE
I have set up the XP with Livebox and it is successfully accessing the
internet
When I tried to install the 98 I got the following message
"#581
Network amplifier F5D5000 PCI card/desktop network PCI card has the address
192.168.0.2. This adapter is on the same subnetwork as the one you are
about to install, this could result in a conflict.
Please disable or unplug this adapter"
How do I do this?
Blair