problem with a wireless network/airport

Not sure if this is where I should post this, but... I have a netgear wireless router that was previously run through an ethernet cable into an older g4 and I used the wireless dongle on a pc in another room. I switched the positions so that now the ethernet runs through the pc and I plugged the dongle into a newer (used) g5 (not intel) running mac osx 10.5.8. I can't seem to get it up on the internet. I downloaded a driver from netgear and the machine recognizes the dongle and says its connected, but airport won't recognize the network and it is greyed out in the network prefs. I tried updating the firmware, but no dice. I should mention that the g5 had the hard drive replaced last year, would that make a difference? I dunno, after hours of searching online, I'm beginning to lose hope! I should mention that I just realized under the system profiler, it lists the airport card, but when I click on it, it says "no information found". Perhaps I need to purchase a new card?

 

No, the router is fine, it is also running an xbox wirelessly. Do I have to use airport to connect wirelessly? in my network prefs, the usb dongle appears to show up as some kind of ethernet connection and it says its connected, but i can't get online?