Deleting Local machine Network Logon policies

I have inherited a network that has 10 W98, 2 W95 and one Server. The old
server (Unix) was removed prior to my arrival. I am going to create the
network from scratch using 2003 server.
My question is: How do I delete the local policy that requires network logon
from the windows machines to the old server. I have temp. worked around the
problem for now by selecting windows logon so they can at least access their
HDD. I want to delete any legacy policies in the local machines and start
fresh when I install 2003 server.