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Windows XP Tips, Illustrations and registry edits
Default behavior of Windows XP is that it automatically logs in if there is only one user account in the system and is not password protected. As everyone tend to create more user accounts and assign passwords for their user accounts, Windows asks for password at logon. Here is a way to make XP automatically login to an user account.
Important: By default, it shows Administrator. You need to input your username and password.
Note that the Tweak UI PowerToy from Microsoft also provides an option to set XP automatically login.