How to reset domain administrator password

I have tested with this hack, able to use in Window server 2008 and Window Server 2008 R2 domain controller.
It is really helpful what if you have forgot your domain administrator password.

Here is the steps:

1. Boot onto DVD of Windows Server 2008
2. Choose “Repair your computer”
3. Launch cmd
4. Go to c:\windows\system32
5. Rename Utilman.exe to Utilman.exe.bak
6. Copy cmd.exe to Utilman.exe
7. Reboot on Windows
8. Do the keyboard shortcut Windows + U when on the logon screen
9. net user administrator Newpass123 inside the cmd
10. log on with the domain admin account and this new pass
11. change the password to remember it if needed
12. Reboot on the DVD to put back the original Utilman.exe

May also watch this video.

http://www.youtube.com/watch?v=Ar-VoO9ogHc

Resource:

http://lordoftheping.blogspot.com/2009/05/i-did-not-use-my-tests-virtual-machines.html