You can Enable and disable Password expiration in Windows 7. In windows 7 System administrator define maximum age for password expiration for a User. Maximum password age by Default is 42 days. If you are Enable Password Expiration then user Password will be Expire automatically after 42 days, then it will ask for a new password.
Enable and Disable Password Expiration
1. Click on Start button then Right-click on Computer and then click on Manage .
2. Now on the Computer management Windows , navigate Local User and Groups , then Click on Users , then on the Right pane Right-click on User (Com-networks) and then Click on Properties .
To Disable Password Expiration
4. Now Check Password never expires check box . and then Click on Apply and then Ok, then , Close computer management windows .
To Enable Password Expiration
5. N0w Go to Step-4 then Uncheck Password never expires check box and then Click on Apply and OK .
Now If User Com-networks try to Log In after 42 days then It will show following error . then you have to give new password .