You don't mention what clients you're running. Since you say you're running windows 2003 as a server, I assume the clients are Windows XP SP2. I've been doing a search on google for -"aquiring network address" xp-. Yes, the spelling is wrong.
My client is pointed at a Linksys 802.11b 4 port wireless router. Bef-whatever. Firmware is current at 1.51xx something. XP SP2, sits there saying 'Acquiring network address'. Same problem. Apparently a bug in SP2. Great. What would Microsoft be without buggy software?
Stew