Hi Smithy, thank you for your support and your immediate answer.
I had a terrible week at work and so I didn't try anything, but today I'm free and just tried to install Cura 4.9.1 ten minutes ago (as the 4.10 version doesn't work, exactly like the 4.11, as I stated above, and I already tried it at least 5 times two weeks ago).
Whenever I try to launch 4.9.1 version, appears the window that you may see in the first image.
I tried several times to install 4.9.1 today, and after some tries I was able to take screenshots of the last passage of the installation too.
During the installation, the window stucks on the 2nd image for 30 seconds (more or less) and after that it switches to the 3rd image for (maybe) half a second before to write "Installation Complete", so the installation bar never reaches the end.
The installation process always terminates in the middle of the bar, as you may see.
Notice that the hard disk is brand new, I just needed to install in my lab a PC running windows 7 pro 64bit for compatibility with all the measure systems I own (I work in the electronic field).
So I installed the PC with a brand new HD, then installed Windows 7 and after terminated the installation of the O.S. I tried to install Cura, since the first day.
The video card is a old NVidia Geforce GTX 275, the PC is equipped with some 4GB RAM and a blutooth/WIFI card (as it is a tower)