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 â€œRepair 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:
    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