Use the Windows 2000 CD-ROM or the Windows 2000 Startup disk to start the computer.
When you see the "Welcome to Setup" message, press R for "repair."
Press C to run the Recovery Console tool.
Select the installation that you want to repair.
Type the administrator password.
If the computer is a domain controller, type the password for Directory Services Restore Mode when you are prompted to do so.For additional information about the Recovery Console tool, click the article numbers below to view the articles in the Microsoft Knowledge Base:
How to Change the Recovery Console Administrator Password on a Domain Controller
Protection of the Administrator Account in the Offline SAM
At the Recovery Console command prompt, type the following commands, pressing ENTER after you type each command:
ren system system.old
ren system.alt systemalt.old
If you have run the Emergency Repair Disk Wizard from Windows Backup and Recovery tools, copy the backup of the System hive from the %SystemRoot%\Repair\Regback folder.
If you have not run the Emergency Repair Disk Wizard, copy the default System hive from the %SystemRoot%\Repair folder. IMPORTANT
: You need to restore the most recent copy of the System hive. You also need to reinstall any hardware device drivers or programs that run as services that you installed since the last time that you updated your Emergency Repair Disk.
To copy the default System hive, type the following command, and then press ENTER:
copy c:\winnt\repair\system c:\winnt\system32\config
To copy the System hive that was backed up the last time that you ran the Emergency Repair Disk Wizard, type the following command, and then press ENTER:
copy c:\winnt\repair\regback\system c:\winnt\system32\config
At the command prompt, type exit
, and then press ENTER to restart your computer.