Dual boot win 7 and 10

salon_sue

I installed win 10 hoping to dual boot with win 7. But it does not work. Can this be done? What I mean is can you trust Microsofts installer to dual boot your system? If not can I fix it? If my prior installation is lost can I add a new one? I installed a secondary drive and issued the command bcdboot "I:\Windows" and this added an option, now I have two Windows 7 options. But neither work, they both begin to start Win 7 (I see the "Starting"...

Originally asked by John on Stack Exchange (superuser) (CC BY-SA 3.0).

uphilltech

Great question — answering as the UphillTech team:

Boot sequence for Windows 7/10 on BIOS/MBR is: 1) MBR on first disk 2) PBR of active partition on first disk 3) boot manager from active partition first disk (which uses BCD for getting boot loader settings and also other settings) When you use two different OS (Windows 7 and Windows 10) on active partition first disk Windows 10 boot manager must be installed . For easily fixing dual boot issues - Dual-boot Repair Windows 10 utility . Has one click automatic solution for fixing dual-boot issues. Automatic repair also makes a backup of current BCD so you can restore BCD if needed. Using "Repair BCD" option of the tool you can easily add a boot loader for the specified Windows system (Windows...

Full answer by snayob: https://superuser.stackexchange.com/a/1028244 (CC BY-SA 3.0).

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