The j# 2.0 runtime was already installed on my system. I reinstalled it (2nd edition x64) and tried again but the exception is stil thrown. The vjslib references in my project point to "C:\Windows\Microsoft.NET\Framework\v2.0.50727\vjslib.dll". The file exists in this folder together with the "...unable to load..." vjsnative.dll and all the other vjs... dlls. Ok, probably I will not be able to get this running.
Thank you anyway Jan!
Christian Klein Software