Resetting Administrator Password in Windows 2008

I made some VM´s using Windows 2008 R2 one year ago.  I forgot the admin password.

I follow this steps to  recover:

• Boot from the Micrsoft Windows Server 2008 DVD
• From the Install Windows menu, click “Nextâ€�.
• Select“Repair your computerâ€�
• In the System Recovery Options, select the Operating System instance that you wish to repair and click â€œNextâ€�.
• Select “Command Promptâ€�. The
• At the command prompt, run the following commands: **
  c:
  cd windowssystem32
  ren Utilman.exe Utilman.exe.old
  copy cmd.exe Utilman.exe**
• Reboot the server allowing Windows to load as normal
• At the logon screen, press Windows Key + U.
• As the command prompt, enter the following command: **
  net user administrator**