Thanks for sharing the details, Alessandro! You mentioned a screenshot, however it wasn't posted in your original reply. Also, you did some online solutions, was part of it to scan the whole system?
Open Command Prompt as Administrator and run:
sfc /scannow
Then this:
DISM /Online /Cleanup-Image /RestoreHealth
If you can upload the screenshot that would be a lot of help.
Best regards,
Kimberly