Passwords can be set so they expire and force users to create a new password in the interest of security. This setting dictates how many days before the password expires a warning will be given to the user.
[Start] –> [Run] –> Type Regedit –> Press Enter –> then Navigate to following key.
Registry Key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
Modify/Create the Value Data Type(s) and Value Name(s) as detailed below.
Data Type: REG_DWORD [Dword Value] // Value Name: PasswordExpiryWarning
Setting for Value Data: [Enter Number of Days Before Expiration to Begin Warnings]
Exit Registry and Reboot
[Source : Windows Xp , Vista , 2000 Registry Tricks Hacks]
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