dopo una settimana ho capito dov'era il problema e finalmente ho aggiornato a windows 10:
fonte: http://forum.avsim.net/topic/472563-to-anyone-getting-the-0x80070004-0x3000d-on-install/...stating that "Installation failed in the First_boot phase with an error during migrate_data operation".
Thought I'd share a fix (as there appear to be a few others on the ORBX forums hitting this too). Found that there was an error with an ORBX file called "TODO" in the C:\Users\Dylan\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Orbx (after hunting around in the C:\$Windows.~BT\Sources\Panther diagerror.log).
Deleted that, and the install completed normally.