I've had this problem for the last year. I have done very single suggested fix I have found through the forums here and on reddit. M&B Warband will not launch through Steam or through TaleWorlds direct download. It will says its running on Steam (and/or on Task Manager as well) but will never popup to allow me to play. I have put over 100 hours into the game and find it frustrating I can not play it, especially for the past year (on and off).