I have exact same problem.When I click on "play" - "preparing to launch" and nothing happens, proces dayz.exe dissapear from system proceslist. I try almost everything - reinstall dayz, reinstal steam, manualy download and reinstall battleye, clean registry, edit firewall rules, turn off firewall and windows defender, install directx sdk, install net framework, edit dayz.cfg - resolution, windowed mode etc., edit dayz steam start parameters, start as administrator dayz, steam, battleeye, turn off desktop theme for dayz, dayz_be and this all for nothing. I always play dayz on my stationary computer and on my laptop - and this annoing issue afect my laptop (Dell Alienware Mx11R2 with i7 and 8Gb RAM). I still can play on stationary computer, but often I use my laptop to play dayz and now I don't know what to do with this, coz I try almost everything and still nothing. Maybe dayz support look at this problem, coz many people have exactly the same problem and can't play game which they pay for. Please DEVS fix this!!!