On a Windows Vista-based or a Windows Server 2008-based computer, you disable the Fast User Switching feature. Later, if the password expires when the computer is locked, you cannot change the password. When you try to unlock the computer, you receive the following error message:
The password for this account has expired. To change the password, click Cancel, click Switch User, and then log on.
However, when the Fast User Switching feature is disabled, the Switch User option does not appear on the logon screen. Then, you have to restart the computer to change the password.