Thank you for your reply.
Unfortunately it does not change anything.
There is the bat file that says that:
64 bit Windows
64 bit Java installed.
The current Java runtime is 1.8
finding the latest Makelangelo JAR…
Found Makelangelo-7.15.5-with-dependencies.jar
java.io.tmpdir=C:\Users\Yanax\AppData\Local\Temp\
juin 06, 2018 9:32:24 AM java.util.prefs.WindowsPreferences <init>
WARNING: Could not open/create prefs root node Software\JavaSoft\Prefs at root 0x80000002. Windows RegCreateKeyEx(…) returned error code 5.
Thank you for your help,
Yanax