How to change Windows 7, Windows 8 and Windows 10 password without knowing old password

Step 1 :- Go to your desktop and right click on my computer. You will see the "manage" option in dialogue box.

Step 2 :- Now you will see Computer management dialogue box on your screen. Now click on system tools>>Local user and groups>> users.

Step 3 :- Select you account , right click on it and and choose set password.

Step 4:- Now new dialogue box will be open, just click on proceed button ,Then you need to enter new password and confirm them, then click on "ok" button,