Hi Philipp76,
It could be possible that there might be remnants files that might be causing the error message you encounter. This can also happen with scenarios like replacing your hard drive after reinstalling your Windows. Only on this case, it's your gaming engine that you're reinstalling. That being said, I would like to know more information about it to assist you further:
- Have you tested if the error happens on a different user profile?
- Have you checked if the issue is happening once clean boot is performed?
- Is the issue still reoccurring after uninstalling the program completely from the Control Panel?
- What is the version and build of your Windows?
- You can have this checked by pressing the Windows button + R on your keyboard to open the Run box, then type winver and press Enter.
Please don't hesitate to keep in touch with me for me to assist you further.