Hi John,
is it possible, that WIN10 has somehow changed the partition of your hard disc. I know cases in which the PC appeared as different hardware after such a partition change, although the physical hardware wasn't changed. The result would be, that although you are still using the same physical PC, the Airnav account management system* thinks that you have installed the SW on another System and/or RB24 login system thinks that you are using another -additional- PC for logins.
* or whatever it is called...
Regards Ingo