*** Updated on 11/21/2007 by Wrobinson ***
You can perform a repair without an ERD using the Windows CD. If this does not work, you can perform a parallel installation of Windows to recover files and folders but be sure not to overwrite existing data accidentally, such as by installing (and thus writing) over them.
If you are unable to successfully perform the repair, the second option would be to reinstall and perform an authoritative restore of Active Directory from backup. Now if you do ont have a backup to restore from, then a fresh installation is in order, followed by recreating all of the user accounts and attempting to salvage any data.
*** End Update ***
do u have Emergency repair disk,
if yes then try to repair from server bootable cd and use repair option.
at the time of repair it ask for Emergency repair disk.