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#11
Along the lines of what Essenbe has mentioned, one way of finding out what windows says about your video capabilites is:
WIN + PAUSE/BREAK key combo | Performance Information and Tools (at bottom of left-hand column) | View and print detailed performance and system information (in center area underneath your Base Score) | at the bottom of the Graphics section you will see DirectX version.
WIN is the key with the Microsoft flag on top.