Win 8 uses Microsoft Live account to log in to the system without losing passwords

        Win8 system can log in with Microsoft ID, or log in with a local account. Microsoft ID login requires a password. But this method allows you to log in to the Windows 8 Consumer Preview without having to enter a password.

open operation input cmd press win + R (right in Metro interface points, all the keys will be the lower left corner of the application, will see into operation), the input window controluserpassWords2, press enter.

in the new window that opens, the "To use the machine, you must enter a user name and password" to remove the hook, point applications

it makes you re-enter the password to confirm two times to complete and then boot would not want to enter a password if you want to restore

enter the password, they "want to use the machine, you must enter a user name and password" hook marked on it.