Changing your windows system password is most easy thing that any one can do from control panel, but what about changing a password from Command Prompt again its easy one a person with little knowledge about CMD commands can change it from Command prompt. But here is glitch when you change password from any of the methods you have to enter your old password then new one.
So what about changing a password from Command prompt without asking about your old password, you can just do it by entering your New Password, And the best thing is you can change any of your friends password of your windows system too. All you need is “Your Computer name or your friends Computer name”, hope you have your computer name and in case you don’t know how to find your Computer name you can refer to: How to Find Computer Name in Windows
So now you have Computer name, next thing you check is that you are the Computer Administration.
Now, search for CMD in windows search: