Hello Stefano,
This problem occurs when the Windows Installer fails to create the boot files on the boot partition.
Boot from the USB stick and then press on your keyboard: Shift and F10 to open a command prompt window.
In the command prompt window run the following commands:
Then take a screenshot with your smartphone.
When done run this command:
Then take a screenshot again.
Afterwards run this command:
And then take a screenshot again.
Upload the three screenshots on imgur.com and share the link(s) here.
Greetings