Adding a machine to a domain

You'll have to excuse me for this (I know tis a simpiltons task) but the specials in support keep asking again... and again... and again!

Log into the machine either with a local user account.
When the desktop appears do the following:
2000 & Windows XP

• Right click on the My Computer and select Properties from the context menu.
• On the Systems Properties screen select the Computer Name Tab and click the Change button
• On the Computer Name Change screen, select the Domian option and then enter a name of a domain e.g. mydomain.local or mycompany.com
• If prompted for a username and password enter one that has privileges to add and remove computers from the domain (usually a domain admin account)
• When the computer is added successfully you will get a message box stating something along the lines of Welcome to the domain
• Press OK
• Back on the Computer Name Change screen press OK
• On the Systems Properties Press OK
• Restart the machine
• When the login screen appears press the Options button and select the newly added domain from the Domain dropdown list
• Log into the machine as a domain user

Vista / Windows 7

• Right click on the My Computer and select Properties from the context menu.
• On the Systems screen select the Change Settings button under Computer name, domain, and workgroup settings
• When the Computer Name screen click the Change... button
• On the Computer Name/Domain Changes screen, select the Domain option and then enter a name of a domain e.g. mydomain.local or mycompany.com
• If prompted for a username and password enter one that has privileges to add and remove computers from the domain (usually a domain admin account)
• When the computer is remove you will get a message box stating something along the lines of Welcome to the domain
• Press OK
• Back on the Computer Name/Domain Changes screen press OK
• On the Systems Properties Press OK
• Close the System screen and restart the machine
• When the login screen appears press enter the name of the added domain and a domain user e.g. mydomain.local\Administrator to log onto that domain

There, now please remember this and stop asking me