Did yo know you? Change Window 7 and 10 User Password without Knowing Old Password. Its very simple trick
lets start
Step-1 Click on Window Start menu and type “cmd” in the search. Then select cmd and Run as Administrator
Step-2 After that type command in cmd.
net user ammar 123456
here ammar is your new username and 123456 is password replace user name and password which you want to change