Hello Basj,
Thank you for your reply. I finally have some time to look into my issue again. I had already tried the solution you suggested and tried it again just now, unfortunately, with no success.
I tried by right-clicking and "Execute as admin" (or something like that in English), and no more luck either.
I tried modifying the restriction of my C-drive, but nothing, still the same error message.
I really don't understand what's happening and I'm completely hopeless.
Maybe I'll be luckier with the next version!
Of course, if you have any idea meanwhile, I'm open to it!
Regards,
/ Nathalie