Wireless Connection to g5 help

I have a first generation G5 tower, just installed airport extreme card. My roommate has a pc which the router is hooked up to his dsL. His computer is hooked up to Lan 1 of the hub on the router (d-link). I setup what was needed on his pc to configure the router. He has a laptop (pc) which picks up the connection no problem, no need to enter password cause none was set up to connect. The problem I am having on my g5 is..I can see the name of the network (router) under the list to choose from for connection but when I click connect its asking me for the password for WEP security...but none was setup.. has anyone had this problem? Any suggestions?