So my question is very simple some weeks ago I bought windows 8.1 and I installed it , then windows 10 launched so I upgraded my system to windows 10 and activate it. But now I worry that I wont have it forever beceuase i'm thinking to change my hdd in like 1 year will I still be able to use windows 10? what if my hdd fail in 1year+ will I lose windows 10? or can I just simply use windows 10 iso on a usb and then use my windows 8.1 key to activate it after the one year?