OK. I've a clean slate due to building a new system. I have a genuine win8 key which I was running before upgrade, and was reserved in the upgrade to 10 program. I'm also an insider, but have never installed a copy of win10. Bearing in mind that my hard drives are blank, and that the only copy I have that is installable, is 10166 on a USB key, what are my options to get 10240 on and activated without hassle? Any help appreciated guys.