I found an answer for this problem (ghosted nic's?) at:
www.jsifaq.com/subf/tip2800/rh2842.htm
"E-Double" wrote:
> After replacing a motherboard on a Win2003 Enterprise server the original
> network connections that were installed apparently got deleted - or more
> appropriately 'hidden' (?). The drivers and two new network connections were
> apparently auto-installed with the default factory settings (e.g. obtain IP
> address automatically, etc...), but when trying to reconfigure them with the
> original settings an error messge pops up that says something to the effect
> of: "The IP address you have entered is already assigned to another server
> adapter that is hidden because it is not physically installed. If the same
> address is used and the hidden adapter becomes active (blah blah) ...." It
> is also weird because every time I try to delete the adapters from device
> manager and then reinstall them they get a higher # like Intel Pro Adapter #
> 9, Intep Pro Adapter #10 (showing that apparently it is saving the old
> deleted and hidden settings somewhere.) How/Where in the registry can I
> 'clean-out' these hidden settings and then install the network adapters again
> as a fresh, clean install ? TIA ...