Well you'd want to move to Fedora Core2 eventually, but probably not just because of this.
According to
here you use drivers from the Linux-wlan project.
The prism2.5 and prism3 cards are similar to the Prism2 cards and are among the most common b cards.
here is a listing of various cards They have your brand but not your specific modle...
Have you got
Yum set up? If not, you should look into it, it makes keeping up to date and installing software easy.
Find a rpm or something that has the linux-wlan-ng drivers for your setup. Do a search in google or if you have yum/apt setup try to see if you can find it that way.
here is a website that has RPM's for Fedora Core1.
Don't know how good they are.
he has directions here
Then once you get that installed, while making sure that you have the correct version for your kernel, then you ought to be able to configure it thru your normal gui configuration stuff.
Other then that I don't know. I've never used a Prism2.5 card before, but maybe check out the forums for Fedora for specific advice if this isn't to helpfull.
edit:
Also check out the
dmesg command. This shows the latest comments to come from the kernel itself, so that if you load a module or whatnot it should leave a comment. It's usefull for troubleshooting something going wrong.