MN-730 doesn't connect to anything

I have an MN-730 which doesn't want to cooperate with any
wireless routers. Even though it displays the SSIDs, it
will not connect to any other brand wireless router
(regardless of whether WEP is enabled or not). It will
connect to my MN-500 Microsoft router, but it can't pull an
IP address via DHCP and if I configure it statically, I
still get no traffic back from the base station. I've
tried all the fixes I can find in this discussion forum and
there has been no change. All other wireless cards and
access points that I own work fine with eachother. The
computer with the MN-730 is a dual PIII 800 running Windows
2003 Server. Any suggestions?

Thanks,
Sean