Simple way to change your windows 7 password.
1. Login to your user account.
2. Press Ctrl+Alt+Delete, and then click Change a password.
3. Type your old password, type your new password, type your new password again to confirm it, and then press Enter.
Your Windows password is the password you use to log on to your computer. You can help keep your computer more secure by changing your Windows password regularly and by using a strong password.
Note
If you are logged on as an administrator, you can create and change passwords for all user accounts on the computer.