Turning off UAC in Windows 2012 R2 with Powershell

In Windows 2012 R2, the slider that we used to use for turning off UAC (User Account Control) does not really work. It is there, but when you adjust it to minimum, nothing happens, it doesn't even ask for a reboot.

Apparently, you have to manipulate the registry to turn the damn thing off.

The following powershell command, if executed from an Admin powershell window will do just that (and immediately notify you, that you need a reboot)

set-itemproperty HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system -name "EnableLua" -value 0