How to recover from a corrupted registry that prevents Windows 2000/XP from starting

For Windows 2000, you may try to download ‘Windows 2000 Registry Repair Utility’. You will also need Windows XP Professional Setup disk.

If you don’t have access to another computer, you can use Recovery Consol to replace and repair registry.

You could install Recovery Console in two way:
(1) Select options to start the computer from the CD-ROM drive. Insert the Windows 2000/XP CD-ROM, and then restart the computer. When the «Welcome to Setup» screen appears, press R to start the Recovery Console, or
(2) Use Windows 98 bookdisk to boot into DOS. Insert the Windows 2000/XP CD and type D:\i386\winnt32.exe /cmdcons, where D is your CD Rom drive. Reboot the computer, select Recovery Console.

Login as Administrator and enter the password. At the command prompt, enter the following:

Depended on which corrupted registry entry, select one or all suit your need. (Replace C:\Windows with your Windows 2000/XP folder.)

Backup current registry:
rename c:\windows\system32\config\system c:\windows\system32\system.bak
rename c:\windows\system32\config\software c:\windows\system32\software.bak
rename c:\windows\system32\config\sam c:\windows\system32\sam.bak
rename c:\windows\system32\config\security c:\windows\system32\security.bak
rename c:\windows\system32\config\default c:\windows\ system32\default.bak

Replace current registry with default registry:
copy c:\windows\repair\system c:\windows\system32\config\system
copy c:\windows\repair\software c:\windows\system32\config\software
copy c:\windows\repair\sam c:\windows\system32\config\sam
copy c:\windows\repair\security c:\windows\system32\config\security
copy c:\windows\repair\default c:\windows\system32\config\default

Type exit to quit Recovery Console. Your computer will restart.

In these procedures, you might lose some Windows settings. For Windows XP, you could do a System Restore to restore the setting a day early that you had problem.

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