Will do ASAP, thank you.

Added (see "Arma 3 Appdata contents.RAR").

Have turned off my Steam Overlay, no change/ same error.

The DirectX updater determines "that a newer or equivalent version of DirectX has been installed already. No Installation is necessary."

No, that doesn't help at all. The guy in that post has "solved" his issue as after installing the newest beta video drivers, his game will temporarily work. I have had no such luck, and am already running beta drivers. I have also tried older drivers with no luck. His error is also a much more common (relatively) "E_OUTOFMEMORY" error, while I've only seen one other "E_NOINTERFACE" error.