What do you do if Windows does not recognize a legacy NIC?

If Windows does not recognize a legacy Network Interface Card (NIC), first ensure that the NIC is properly seated in its slot and that all connections are secure. Next, check for any available driver updates on the manufacturer's website or use Windows Device Manager to search for new drivers. If drivers are unavailable, consider using compatibility settings or a different PCI slot. Lastly, if the NIC is still unrecognized, it may be worth testing the card in another computer to rule out hardware failure.