Use a 3x licence with a Norton AV bought online

Hi,

 

       I'd like to know, how can I use a 3x lincence of my Norton Account from a Norton Anti-Virus that I bought online, to upgrade an earlier version of the desktop computer, on another computer (laptop with a finished licence Norton Anti-Virus) and also in the same computer after reinstalling the windows (that has a major problem)???

 

       Once the key presented on the Norton Account is bigger in digit numbers than the input key required by the renewall of the expired licence on the laptop...

 

       And on the desktop, after reinstalling the windows, what Norton Anti-Virus program should I install to receive the key licence of the Norton Account (as I don't have a program copy in my desktop computer, because it was an upgrade bought online and directelly installed)??

 

 

Thanks