Reinstalling Norton 360

Hi all

I recently purchased a new laptop and installed Norton 360 on it. The Norton product was a "licence for 3 devices" version.

My new laptop came with Windows 8.1. However, I am concerned it may not be genuine Windows which means when Windows 10 comes, I might have to buy Win 10 and clean-install it, meaning the Norton 360 will be wiped off and I'd have to re-install that. Obviously, I hope I can establish that the Windows 8.1 is genuine, but just in case...

If (hoping I don't, but IF...) I need to re-install Norton 360 to my new machine, how do I do that for the original licence - I mean, without using one of the other two licences?

Don't know if that makes sense but hope it does.

Cheers

ausgumbie