Greetings. I tend to do a complete reinstall about once every year or so. The obvious question for me is if I upgrade to Win 10 from Win 7 Pro, will I be able to 're install' Win 10 again if I need to on down the line? Say 6 months AFTER the free offer expires I have the upgraded to Win 10 but want to rebuild my system. I imagine ill have to 'reinstall 7' then wait for it to recognize my key then upgrade. Does anyone 'inside' have information on how this process would work? Thanks!