Reaction Forces. But thats not the problem if the game started, i can activate the dlc ingame, then the game restarts itself and i have no problems. But if i start with launcher and activated one dlc, the LAUNCHER and STEAM shutdown

An update. If I start the game without DLC's and mods (I don't have any mods anyway) everything works. I can then activate the DLCs in-game, restart by asking in-game and then everything works. It just doesn't work via the launcher.

Its not the Graphic Card or something that mades problems. If i Start Arma 3 with the launcher, Steam and the Game Shutdown everytime. If i start "arma3battleye.exe" and "arma3_x64.exe" (without the launcher in the folder of the game itself) then it starts Normaly without a problem. but on this way i dont can play any DLC