Active Directory Domain Services

Naming information cannot be located because:

The RPC server is unavailable.

Contact your system administrator to verify that your domain is properly configured and is currently online.

sir,

      please give a solution

Hi

 Please check this detailed article about "rpc server is unavailable"

http://social.technet.microsoft.com/wiki/contents/articles/4494.windows-server-troubleshooting-the-rpc-server-is-unavailable.aspx

Hi,
 
If TCP/IP NetBIOS Helper service is not started, you might see this error. I would suggest you check if the service is started or not first:
 
 1. Click "Start", type "services.msc" in the Start Search box, and then press "ENTER".
 2. Locate and then double-click the "TCP/IP NetBIOS Helper service".
 3. In the "Startup type" list, click "Automatic", and then click "Apply".
 4. Under "Service status", click "Start" to start the TCP/IP NetBIOS Helper service, and then click "OK".
 
Here is a similar thread about this specific error, you might want to have a look and see if it is helpful for you. 
 

Regards,

Eth