Based on your output, please type the following at the command-prompt pressing enter after each line.
If at any point something doesn't match what I am explaining please stop and ask.
Select Volume 3
assign letter=z:
list volume
At this point I would expect your Volume 3 (shown below) to show drive letter Z after the Volume 3 label.
Code:
Volume 3 FAT32 Partizione 100 Mb Integro Sistema
If it does, continue on. If not stop and let me know.
exit
cd /d Z:\EFI\Microsoft\Boot\
attrib Z:\EFI\Microsoft\Boot\BCD -h -r -s
bootrec /fixboot
ren Z:\EFI\Microsoft\Boot\BCD BCD.old
bcdboot c:\Windows /l it-it /s z: /f ALL