Hello again!
I had some problem in finding
Command Prompt
Then I realised that there was instead
Windows Power Shell (Admin)
I found the way to go back to Command Prompt and it worked
“For those who prefer to use Command Prompt, you can opt out of the WIN + X change by opening Settings > Personalization > Taskbar, and turning ‘Replace Command Prompt with Windows PowerShell in the menu when I right-click the Start button or press Windows key+X’ to Off.”
and it worked.
Then I tried to do what you suggested to me, but I could run the commands only one at a time. So I repeated the operation three times, every one for each command.
But then I was told that there was nothing corrupted and all was fine. Now I try to restart the PC and then I'll tell you if anything has changed. Thanks