Thank you Fotis to take the time to give me these advice.

I am conscious that my tools need renewal. Both have some problem, because, at the time of Microsoft offering to switch to Windows 10, I tried to do it and in both cases it didn’t work, I had to return to the original OS, Windows 7 for the Medion, Windows 8.1 for the Dell. The main reason for me to stay in Windows is Office, mainly Excel, since I have a lot of programs in Visual Basic for Excel.

Your suggestion to try a Linux based OS for my Windows 7 PC is very tempting, I think I will try it some day…
I will in any case keep you updated with the tentative, and also if the blocking factor on the main PC is at last identified and removed …