Step 1> Press the key of Windows and find its option of computer in the left side. Right click on PC and it opens the option to administer.
Open manage options in Computer window.
Step 2> Now you see the dialogue picture Administration on the screen. Clicks on
system Tools>>local user and groups>>Users.
Step 3> In the right side the name of all the users are flashed.
Step 4> Select Account, clicks right and select to establish password. Now establish password in the window.
step 5> The new opened emergent window, clicks on the button to continue. Now introduce the new password and confirm them, next, clicks in button “OK”.
Step 6> Now password of session has changed correctly .You can re initiate the system and consults with its new password.
So with this trick you can change any password of system of Windows without knowing old Password.
This trick works in all the versions of the window like Windows 8 and 10 of the window.