Windows XP application is defined for users Automatic system login process. At many users accounts had created with user identification name and password. Windows need a security word for the booting process. It is specifically used to the computer for testing process more than one time consecutively with the correspondent user account. First you have to do the login process with the use of register entry.
To open the ‘Register Editor’ by opening ‘Start Run’, enter ‘ regedit’ and click ‘OK’.
Now, navigate to the ‘HKEY_LOCAL_MACHINE Software Microsoft Windows NT Current version Winlogon’.
First you have to open-> ‘AltDefaultUserName’ – this is used to enter the valid user account that wants to login automatically.
Now click on ‘Edit -> New -> Character String’ and create the entry of ‘AutoAdminLogon’, Double Click on it and set the value to ‘1’. Subsequently create the character string ‘DefaultPassword’ and as the ‘Value’ assign the password of the user account.
Incase other user have to access your system without your permission, this process is complicated security effects. So, you have ot set value is ‘0’ means, then the system login process is deactivated. If while booting the system, you keep the space key pressed, Windows ignores the automatic login and you can login to another account.

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You can also control the Windows log-in by executing “control userpasswords2″ in the Run dialog of windows.