If the machine is already in a domain, his DC has to be up so the computer can call his DC for a double-check
Then, launch the 'launch.ps1'

Tips :
 - You can create a .lnk to the launch.ps1 to make it easier to launch

 - You can change the default application used on a double click of a .ps1 to allow users to launch a .ps1 just double-clicking on it

 - You can create a Task in the task scheduler that will be run with highest priviledges and will be launched every logon

 - You can add a key : 
    The keys:
        HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run - Runs programs for all users.
        HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run - Runs programs for current user.

- The maximum caracters of a computer name is 15
- There is a file created during the process, named old_computername.txt that will go on C:\old_computername.txt
 and will contain the old computer name, IF YOU REMOVE IT, YOU CAN RESTART THE SCRIPT