NBT and Netlogon Error Messegs

I am running 1 Domain Controller with Windows 2000 Server
I also have 1 Member server running Windows 2003 Standard Server with MS
Exchange 2003 on it.

When i check the Event Viewer System logs on the windows 2003 server, it is
flooded with NBT (Event ID 4319) and Netlogon (Event ID 5719, 5783) messeges.

The PDC is always online and there are no duplicate computer names on the
network. Any ideas as to what is causing these??

Thanks,
Greg