Apparently there is a bug in the sample script for _WinAPI_EnumDisplayDevices. This happened with my older install and with the latest version There's an exitloop that doesn't work. It enumerates about four devices then just loops forever displaying nothing. I don't know the solution for this. I'm using Windows 7 64-bit, UAC is turned on (default) Original sample code in help: #include <WinAPI.au3> _Main() Func _Main() Local $aDevice, $i = 0, $text While 1 $aDevice = _W