irql bsod 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