In 2012 I bought a retail copy of Windows 7 Home edition and installed it into the system I built. Since 2012 I took advantage of a free upgrade to Windows 10. I am now looking at finally upgrading my computer system and building a new system. I confirmed a few years ago on the forums that I have a legal copy. I am finally going to do the upgrade I didn't do a few years back but how do I actually get Windows onto to the new system? I need the steps. What happens if I ever need to power up my old system, can I access the files?