Method -2 Change Window 7 and Window 10 Password Without Knowing old Password from Command Prompt

Step-1 Click on Window Start menu and type “cmd” in the search box. Then select cmd and Run as Administrator.
Step-2  After that type command in cmd

  net user rahul 123456 

Now you can replace rahul with your username and 123456  with your new password. Now your password has been successfully changed without knowing old password. You troll your friends with these tricks