When you first install Windows, it prompts you to create a user account and choose a name for it. This becomes your logon name (also called as the user name). Windows also creates a separate display name for you. If you type your full name when creating an account, Windows creates a logon name based on the first name and your full name is stored as the display name. You can easily change your display name from the User Accounts Control Panel but what about the logon name? You can change the logon name too without having to create a new user account but the way to change it isn't so obvious. Here is how to do it.