Enable NetBIOS Over TCP/IP (NetBT)
Windows peer-to-peer networks use the NetBIOS (Network Basic Input/Output System) applications programming interface for File and Printer Sharing. NetBIOS names identify computers on the network. NetBIOS broadcasts locate computers and shared disks and folders on the network and allow them to appear in My Network Places and Network Neighborhood.
NetBIOS is not the same thing as NetBEUI (NetBIOS Extended User Interface):
The NetBIOS API must be enabled over one of the transport protocols: NetBEUI, TCP/IP, or NWLink IPX/SPX. Networks that use TCP/IP for File and Printer Sharing require NetBIOS Over TCP/IP, also known as NetBT.
To enable NetBIOS Over TCP/IP on Windows XP and Windows 2000: