So i am trying to temporarily get around upgrading my win7 to win10 by dual booting. I know i cannot obtain a product key without upgrading from my 7 but my work at home program is not win10 ready yet. My solution was to clone my win7 drive, upgrade one of them and viola, violate the system long enough for work to catch up to me. I used Macrium Reflect to clone my drive to an empty partition, when going to the OS selection in my BIOS it only shows 1 windows 7, if i try to change the drive that i want to boot it tells me Bootmgr missing. any ideas on how i can fix this?