IRQL BSOD in TCPIP.SYS

Installed NT6 on a Dell D600 with Gig-E while connected to docking station,
all was good - domain connectivity to AD, internet, etc. - when worked later
that evening, booted and connected to Linksys wireless G and again, all was
good - figured out how to config for a non-broadcast SSID (though not as
friendly as I'd expected) but now when re-attached to docking station BSOD
with TCPIP.SYS and IRQL less than/equal error... Installed PC-cillin for
Vista trial, but no other apps installed, and tried with wireless enabled and
disabled in hardware...

Anybody seen this yet, or had any similar issues?? Not sure what else to try
for install/uninstall or reconfig...

P.S. - BTW - glad to see IPV6 support in the beta release and all the
additional networking options - but what's up with IPCONFIG /RELEASE at a
prompt "requiring elevation"???

Thanks