Step-1 Press Windows Key and Find Your Computer option on Left side. Right-Click on Computer and open Manage option.
Step-2 Now you see Computer Management dialog box on your screen. Click on system Tools Local Users and Groups Users.
Step-3 Now in Right side you see your all Users name.
Step-4 Select Account right click on it and Choose Set Password.
Step-5 Now the New Popup open , click on proceed button. Now you need to Enter the New Password and confirm them, then click on OK Button.
Step-6 Now your login Password has been successfully changed .you can restart your system and check with your new password.
So with this trick you can change any Windows System Password without Knowing Old Password.This trick works in all Window versions like Window 8 and Window 10.