What did not please me is the product description of the dealer, because contrary to the ad, you get only a Dell CD with cut-Key list. Of course, this explains the low price, but an authentic picture and description at Amazon were it only fair! Concern I had about a month operating period when the (analogous) Microsoft message came: "You may be a victim of piracy Please verify your operating system." To all users who run into a similar problem, simply:
Control Panel \ System and Security \ System
Enter the supplied product key and then you're on the safe side. Strangely, this is not required during installation and detected the error after the first system updates from Microsoft. One problem that can easily fix, however.