Windows 8.1 help

Hi,

So im thinking of downloading and installing windows 8.1 later but i want to make sure that norton IS will work on windows 8.1, i think a read somewere about norton having to be on verson 21. if that is true how do i update.

When i update would i have to reinstall norton?

and another question, when upgrading to 8.1 do i loose all my files and have to start fresh on my pc?

 

Thanks for reading.