PCs Disappearing from N/N

Hi, maybe someone could help me with this?

I have a Windows 98 PC set up as follows:
TCP/IP
File and Print sharing For MS Networks
Netware Client 3.3 (Primary Logon)
Client for Microsoft Networks

This PC resides on a Netware network. It is schedule to run a batch job
periodically, which maps a drive to Windows 2000 server, copies some files
and deletes the mapped drive.

However, PCs in N/N disappear and thus the batch file does not run, a
network error 53 is returned. Although it is still possible to ping the 2000
server and other pcs.

I figured this may be a master browser problem, so I made an entry in the
LMHOSTS of:
10.0.0.16 controller1 #pre #DOM:domainname
10.0.0.16 "domainname \0x1d" #pre

10.0.0.16 is the BDC, which has been configured as Master browser rather
than the PDC due to network setup. The BDC is also the Primary Wins Server.

I'm all out of ideas, maybe I've got something hideously wrong.

Anyone help please?

Cheers, Steve.