Simple tutorial showing how to reset any Windows 7/8/10 account password using Windows Recovery Environment.

Reset Windows 7/8/10 Password
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The Ease of Access Center Method

Reboot into Windows recovery environment. If you don't have one, create a bootable USB using the method 
described in https://www.youtube.com/watch?v=Q8gQuYekACU or just burn a Windows 7/8/10 ISO to a DVD.

Boot using the USB / DVD.

Click Next - Repair My Computer - Troubleshoot - Advanced Options -Command Prompt
or Simply press Shift+F10 anytime.

Type the following commands:
cd /d C:\Windows\System32
ren Utilman.exe Utilman.exe.bak
copy cmd.exe Utilman.exe

Here, we basically change the executable for Ease of Access Center with that of command prompt.

Type exit and click on 'Turn off your PC'.

Now, remove the USB and boot into Windows.

Now, click on 'Ease of Access' icon. A command prompt will open.

Now, you have two choices. Either you activate the admin account, login, and then reset the password 
for other user, or, change password directly.

In case of 1st option, type this:
net user administrator /active:yes
net user administrator *
..Type the password here. It won't be visible, for security reasons :)

In case of second option, type this:
net user
..See the username of the user you want to reset password for
net user replace_this_word_with_username *
..Type the password here. It won't be visible, for security reasons :)

Type exit and hit enter.

In the video, I followed the first method.

Time to revert back changes.

Click on 'Ease of Access Center' again

In case of 1st option, type this:
net user administrator /active:no
Type exit and hit enter.

In case of 2nd option, do nothing :)

Boot again, to the recovery environment. Open Command prompt. Now type:
cd /d C:\Windows\System32
del Utilman.exe
ren Utilman.exe.bak Utilman.exe
exit

Now remove the bootable media and reboot back to Windows!

Done! :D

That is all folks! :D