You do not need netbeui. Netbeui was used when operating systems were Windows for workgroups 3.11, Win NT, Win95, Win98(original version). This was used in earlier Microsoft and Novell networks. <- oldtimers in geekwork should remember Novell with 10baseT
But follow all the points that BlueStater mentioned. "Make sure Client for Microsoft Networks is installed all around, as well as File and Printer Sharing. " Use the same workgroup as mentioned by pmbuko. Most importantly that you are running Win98 "Second Edition" with any of the Win XP,XP Media Center Edition, Win 2000 or 2003 network.
To see other drives in the network ... open up Windows Explorer...right click any directory on your hard drive....sharing...share this folder.
Also XP, 2k create default usernames to log in. Usually Administrator or whatever name you use to log in. 98 by default does not login as a user. tleigh's suggestion might be the ticket.
