Hi Paul
The problem as I see it:
-3 secure access points that will not allocate a dynamic IP address.
-1 secure access point that will not allocate a dynamic IP address.
Need more info:
-MS server 2000 or 2003?
-What is the card in the back of the wireless computer thats trying to connect to the AP's
Solution Ideas:
Starting with one AP
-Reset to factory defaults for the AP.
-Set up AP to allocate dynamic IP address
--Failing that turn off DHCP and assign a static IP on the wireless computer.
--Assign a class C network IP 192.168.1.???, subnet of 255.255.255.0
-Set all computers to the same workgroup "WORKGROUP" etc..
-Check the domain settings of the computers and what domain MS server is set to handle.
-If you get a connection going then implement security.
-Check that you dont have the card in the wireless computer & AP's set to the wrong mode (adhoc).
--Set to infrastructure.
-Check that the AP's arent set to repeater mode or rolling ssid.
-Unhide the SSID
-Check that MS server is set to allocate IP addresses to the network.
-Check that the IP TTL is not set to some ludakris small time.
Thats just a couple of ideas im sure you have tried most of them, but i just chucked them in there incase.
Hope this helps.
Joe