Windows 10 password reset

You need to have the Windows (7|8|8.1|10) install media available.

1. Start your PC off the (Disk|USB|HDD) that contains the install media
2. Once loaded, press Shift+F10. This will open a command prompt
3. Run the following commands in order:
   
diskpart
list vol

1. Once you find the right volume (your C: drive (it may have a different drive letter!!!)), run exit
2. Now, run D: where D is your drive letter. (probably the biggest volume in MB)
3. Run cd \Windows\System32
4. Run ren Utilman.exe Utilman_old.exe
5. Run copy cmd.exe Utilman.exe
6. Reboot

Once you get to the logon screen, click the Accessibility Options icon. Once the Command Prompt opens, run these commands, replacing user_to_change with the user you want to reset the password of:

net user user_to_change *

Enter a new password, enter it again (you won't see it) and log in.
You can now go back to C:\Windows\System32 and delete the Utilman.exe that we made,
and rename Utilman_old.exe to Utilman.exe

You are done!

If you for some reason can not rename Utilman_old.exe then follow next instructions:
How to delete trustedinstaller files
https://www.youtube.com/watch?v=DD9RtM5J6bE