Change forgotten Administrator password

Reset a Windows 10 password

2008:
Press F8 (or Ctrl?) upon startup
Choose "Repair your computer"
Choose "Command prompt"
C:
cd windows
cd system32
move Utilman.exe Utilman.exe.bak
copy cmd.exe Utilman.exe
Restart
(boot normally)
on Logon screen press Windows+U
net user Administrator new_policy_complience_pwd
after successfully log on using new pwd, reboot to recovery again to restore original Utilman.exe