PROBLEM:
Install the Active Directory Schema snap-in
To install the Active Directory Schema snap-in
SOLUTION:
Open a Command Prompt, Run as Administrator.
Type:
regsvr32 schmmgmt.dll
This command will register Schmmgmt.dll on your computer.
Type mmc /a, and then click OK.
On the File menu, click Add/Remove Snap-in, and then click Add.
Under Available Standalone Snap-ins, double-click Active Directory Schema, click Close, and then click OK.