Ok. First of all I have used a Dlink DWL-650 with win98, and now a Orinoco Gold clone (Dell TrueMobile 1150) with win98SE. (on a Dlink router/switch with about 6 wired computers and 3 wireless ones)
Put NetBios on all your machines to make networking easier.
See if you are able to access the Router (AP) with your Fuji...ensure good signal, correct ID etc. Try to access the router admin setup with the fuji.
If all that works then the wireless portion of the Fuji works. (if that doesn't work, then it is a driver or setup, or client program problem)
You must share something to see the computer on the network (sometimes)
If your other computers are running XP or 2k then you will really want netbios on all the computers
If you have a firewall, then make sure it isn't blocking the network.
I could go on and on...but start with the simple steps. I use wireless on the fuji all the time, I administer the fuji installed in my truck using the wireless network.