I did that but it didnt change the outcome.
I took the original Video file and tried to export it (file without cuts etc.) and it failed at around 35-40%
I then took another Video file, which is abiut 2 min long and tried to export it and it failed again at 40%
Somehow my Programm hangs itself at 40% xD
Edit: Reinstall didnt do anything. I Set the Frames from 60fps to 25 fps and i lasted unil about 45%
Edit2: I read alot in the Forums about diabling hardware encoder box. My was already disabled so i enabled it and now it works xD
Thanks for your time and the fast replies