I have an old Dual 450G4 running 10.2.8 and Apple Admin Utility 3.1.1 I used to use it just fine with my older system based on Apple Expresses all over the house. I now have an Extreme and 2 scattered Expresses for iTunes, but after bringing out my old Dual 450, it keeps saying "There was an error joining the selected AirPort network." I KNOW that it is correct. Is this a WPA/WEP issue? or what could be the problem? Would finding some of my older airport discs help? I really want to get this running for my 3 daughters in the bonus room. Homework is increasingly needy of the internet. All ideas are VERY welcome!