I already tried starting with Admin rights and also tried every compatibility mode.
Windef, Firewall, and Antivir were disabled during the process.
The Eventlogger says : The Application was Unable to Start Correctly (0xc000007b). Google has spit out these solutions:
- Install the latest .NET Framework
- Update/reinstall DirectX
- Install latest graphic cards drivers
but nothing helped

Any help appreciated. Thanks in advance