It’s a very easy trick and you can change the password of any computer without knowing their current password with this easy trick.
1.Right click on My Computer/This Pc .
2.Click on Manage .
3.Click on local users and group .
4.Double Clcik on Users,
Right Click on User Name which you want to change the password .
5.User Name belongs to the Name of that Computer User
6.Clcikon Set Password .
7.Click on Proceed .
8.Enter you new Password .
9.Conform you New Password .
10.Click on Ok .
11.Again Click on Ok.
12.Now your job is done