Maybe your new (old) computer has a B wireless adapter and your router is G?
Hey Grumpy at least you get to go to work, I am in forced retirement at 61! Anyway what I have on that old Dell that did have ME OS but I installed XP is a Linksys Network PC card that has on a rare occasions shown my home network but has never been able to connect to it. It mostly only will show others wireless connections in the area. I did try use the Ethernet line but that too did not work?