The following is a good place to start:
Troubleshooting "RPC Server is Unavailable" in Windows
http://support.microsoft.com/kb/224370/en-us
"Alan" <(E-Mail Removed)> wrote in message news:
> Our server is memeber of the domain, but we are not able to register DNS.
> When I try to repair NIC card I'm getting error: unable register DNS.
>
> From command promt:
> C:\>ipconfig /registerdns
>
> Windows IP Configuration
>
> Registration of DNS records failed: The RPC server is unavailable.
>
> Any help will be appreciated.
> Thanks,
> Alan.
>