[Samba] Name resolution problem

[Steve]

When i run "nmblookup -U dspsvr -R dspwg#1b" i get the following:

querying dspwg on 192.168.1.10
192.168.1.10 dspwg<1b>
192.168.1.15 dspwg<1b>
192.168.1.18 dspwg<1b>

The correct 1b server is at 192.168.1.10. I do not know how the other two entries show up here.
192.168.1.15 is just a WinXP Pro client system.
192.168.1.18 is not an IP used on our network.

The problem is that now when we try to log into the PDC (192.168.1.10) we sometimes get errors
because the clients are looking at 192.168.1.15 or 192.168.1.18. Sometimes when we get logged
in fine it later causes problems by jumping IPs.

The PDC is the only Samba server on our network.

Anybody know how to get rid of the incorrect entries?
I have tried shutting down all systems on our network, including Samba hoping that this would reset
the netbios cache to no avail.

I appreciate your help!

Thank you,
Steve