Thanks nickmow and GIXXeR for your reply.
GIXXeR, tks for the java-link, it seems I downloaded the wrong Java.
Now I get at least the start.bat working and the panels start up.
However within DCS my panels don't work.
When I start up the keys.properties file, the system begins to start up DCS, but I get a totally black screen immediately, and that's it. Have to shut down DCS by using ctrl-alt-delete.
May be I did something totally wrong, but really tried everything I could thought of. Maybe somebody still has an idea...