Thank you very much. I have read through the log files and found that two plugins are loading one x64 and one x86. I noticed that the x86 plugin failed to load when Volanta started. When starting the simulator you could see that Simconnect was set to “False” and Volanta tried to load the x86 plugin at least 20 times, which of course also failed. Volanta then tried again and again but the connection to the sim was never established due to the plugin not loading.
I then checked whether the Visual C++ Redistributable x86 was installed and saw that it was indeed missing. I then installed it from the Microsoft site and it actually worked. It was just not installed after the reinstallation of windows. Thank you very much, I should have realized much earlier to look at the log file and I can finally use Volanta again.