On a brand new Dell Server I have installed Windows Server 2008 standard
edition.
The existing domain is controlled by a two server win 2003 AD setup and as
part of the installation on the nw server I upgraded the schema of AD 2003 to
be compatible with AD 2008.

After booting the server I have access to AD Users and Computers (and
windows logs via event viewer) for a short while but eventually I get the
error (when trying to load AD Users and Computers):-

"Naming information cannot be located because:
The RPC server is unavailble.
Contact your administrator to verify that your domain is properly configured
and is currently online"

When this happens I also have problems viewing the windows logs using Event
Viewer. I get the following message when trying to view the Windows
Application or System logs:-
"One or more logs in the query have errors
Log: System (or Application, etc)
Error: Insufficient information exists to identify the cause of faiure"

I then demoted the server from being a DC and de-installed AD DS. Once I do
that I have no problem with the event viewer.

I have two other DC's on the network (AD 2003 upgraded to AD 2008 schema).

With the addition of Win Serv 2008 I wanted to have three DC's and I
configured all three as Global Catalogs (Don't know if this is required as
its only a small network with no inter-site communications). I set all three
as GC's so that any one of them could process logons and authentication in
case of a single server failure.

The only thing I can think of is completely re-installing the OS but if I do
that I cannot think that I would do anything differently.

There are two network cards. One disabled and one active. I have unticked
TCP/IPv6 on both cards as they were causing error messages as they weren't
fully configured.

The server has 4GB RAM and loads of free disk space.

Can anybody ?