If you don't have a supported NIC installed, either from the NT CDROM or a third party, or if there is a null entry in Oemnadx.inf, the subject behavior will occur.
If you have an adapter installed, use Regedt32 to modify the following values at:
where n is the number of the installed adapter.
Title is a string (REG_SZ) value name that contains the product id, such as:
\[n\] 3Com Fast EtherLink Server NIC
Description is a string value name that contains additional descriptive information, like: