System: Windows Server 2008 R2 SP1

>> First,raise the forest functional level to Windows Server 2008 R2 using Ldp.exe
1. Logon as Administrative privileges(ie.Administrator,Domain Admins) your Windows AD DC.
2. On Windows Start Button type Run type ldp.exe
3. On Ldp click Connection menu select Connect…
4. In the Connect box type your full AD server name then click OK.
(Note: You can check full computer name by right click on Computer select Properties)

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