Everytime when i start the launcher and i press the play buttom, the launcher disappears and after 10 sec the launcher appears again and in the log files i see this error: (exit code -1073740791).

The same exact thing happens to me. I also noticed that the launcher downloads updates every restart but hasn't actually updated its GUI. It looks the same as ever instead of the new way it's supposed to look.

Duplicate of MC-112780

Hotfix for nvidia http://nvidia.custhelp.com/app/answers/detail/a_id/4378/

the nvidia link worked! thanks you so much!
great job