Wireless domain logon

I'm trying to setup a wireless PC (XP Pro SP1a) to logon
to a Windows 2000 Server based domain. I have added the
schema extensions to Win2K Active Directory and when my
XP machine starts from a cold boot, the wireless
connection is made, I logon to the domain and logon
scripts run etc. We only want to set up a few machines,
so we are using WPA-PSK (No certificate servers). If I
logout and then try to log back into the network, the
wireless connection is not made and I can only logon
locally. No network logon scripts run etc. To logon to
the network I have to completely shutdown and restart.
We are using a D-Link DWL-2100AP Access Point and D-Link
DWL-G520 PCI NICs. D-Link is telling me it's an XP
problem. An suggestionS?
TIA
Steve S.