So guys you can change the password of your pc without knowing the older one.
you have to follow the following steps:-
1.open command prompt and run as administrator.
2.then type net user and hit enter
3.this command will shows all the accounts in your pc.
4.then select the account to which you want to change password.
5.let the account name is Master and the new password I want to set is Akshat
6.then type net user Master Akshat
7.then hit enter your password has been changed