Netwoking Windows 98

My problem is that I am not able to open the workgroup.
I
am not able to get to any server in this workgroup.

In my network my main server is Novell 5.1, I have 225
workstation with about half running from Token ring and
the other half running ethernet. I have three network
card in this server a tokenring, and two ethernet. One
of
the ethernet is inside and the other is outside.

I also have a Windows NT server running E-Mail and Web
serveing. I have a Windows 2000 server with our student
database. The Windows 2000 server is the one that I am
not able to login to from all of the workstations. I am
able to login from any of my Tokenring workstations but
only able to login to this server from part of my
ethernet
workstations. The Windows NT server is running from a
workgroup of "wiggins50" and the Windows 2000 server is
running from a workgroup of "workgroup". I am running
IPX
and TCP/IP from every workstation, but only have
microsoft
networking running on the workstations that need access
to
the Windows 2000 server.

Any ideas whey I am not able to access the Windows 2000
server from every workstation the is running Microsoft
networking?