Perform Authoritative Restore of a Subtree or Leaf Object

This step marks the subtree or leaf object you restored as authoritative for the directory.
Requirements

·         Credentials: local Administrator

·         Tool: Ntdsutil.exe

To perform authoritative restore of a subtree or leaf object

1.       Open a command prompt and type ntdsutil and then press ENTER.

2.       At the ntdsutil: prompt, type authoritative restore and then press ENTER.

3.       At the ntdsutil authoritative restore: prompt, type:

4.  Restore Subtree OU=ouname,DC=domain,DC=domainroot 

For example, if the administrator has inadvertently deleted the Marketing organizational unit in the domain called contoso.com, type:

Restore Subtree OU=Marketing,DC=Contoso,DC=COM 

5.       At the Authoritative Restore Confirmation dialog box, click OK.

6.       Type quit and press ENTER until you have exited Ntdsutil.exe.

7.       Restart the server.

Ref: http://technet.microsoft.com/en-us/library/bb727062.aspx