1. Restart the server
2. Press F8 when comnputer loads to get into the windows menu.
3. Select directory services restore mode.
4. Login to directory services restore mode using administrator credentilas.
5. Open command prompt 
6. Type ntdsutil and press Enter.
7. In ntdsutil prompt, type "Files" and press Enter.
8. In file maintenance prompt, type "integrity" and press Enter.