If the IPs on the Win98 boxes are static and you are using NetBIOS names on all the machines (no "dot-coms"), then just use a LMHOSTS file on you Win2k box. Normally, the NT/Win2K boxes look for a browse master and when using Network Neighborhood. Now, one of the 98 boxes was probably the browse master, but when the Win2K box came online, it declared itself the senior machine on the network and became the new browse master. Unfortunately, this means that you have to wait anywhere from 15-60mins for all the machines to get on the new browse master's list. While the 98 boxes will talk to each other when looking for a browse master, the NT\Win2K boxes don't seem to. So, unless you set up a server as your WINS/DHCP/Browse Master on your network, you may be in for long browse requests to come. Just go straight TCP/IP for all the machines, and use a LMHOSTS file (c:\winnt\system32\drivers\etc). The file should give you all the instructions that you will need to setup your network. If you have any questions, let me know.
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Regards,
clutch