How to Change Windows Password without Knowing the Existing Password-: You can change the password without knowing the existing password. But this trick works only when your PC was logged in.
How to Change Windows Password without Knowing the Existing Password-:
Right click on computer and select manage.
Go to Local users and Groups option and then click on users. You can see the list of users.
Right click on the user whose password you want to change and then select set password.
click on proceed on the pop-up window.
Enter the new password and click on Ok.