how to reset domain admin password on a Windows Server 2008

I did not use my tests Virtual Machines for some times just after installing them....I forgot the domain admin password :'(
I found a hack for Vista, that i reused for my Windows Server 2008 Domain controller !
I just pushed it a litlle further by only using the official Windows Server 2008 DVD from Microsoft instead of backtrack :)

For people in hurry, here are the steps:

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