How to Change a Computer's Password
Windows makes changing your password on your computer straight-forward and quick. It is highly recommended that you change your computer's password on a regular basis. This helps keep hackers off your system, especially when you have valuable or sensitive material on your system.
Press the Ctrl, Alt and Delete keys on your keyboard at the same time.
Click the Change Password button in the window that appears. This button is in the left corner of the window.
Type your old password and your new password in the appropriate fields. Type your new password in the confirm field.
Click the OK button.