how to turn off Accessibility button function at Windows 7's login screen

reg add "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\Utilman.exe" /v "Debugger" /t REG_SZ /d "systray.exe" /f

source: https://superuser.com/questions/196989/how-to-remove-or-disable-ease-of-access-button-on-windows-7-login-screen