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I have two hard drives on this computer. I used to dual boot Windows 8 and Windows 7, each separated by physical drive. Windows 8 was my primary OS. I recently re-installed Windows 7 (overriding the existing Windows 7 installation) and lost the OS choice prompt.

How do I boot to Windows 8? How can I edit the boot record and tell the machine to look for another OS or give me the option to choose when I start the computer?

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  • Do you have windows 8 installation media, have you tried to repair instalation? Commented Feb 24, 2015 at 12:42
  • I do have the installation media and I have not tried to repair installation. I should be able to boot into Windows 8 using it? PS. Now I want Windows 7 to be my primary OS.
    – Muffin
    Commented Feb 24, 2015 at 12:58

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there was already a similar question here How to use BCDEdit to dual boot Windows installations? , but your case is on reverse-direction.

Assuming that you're currently on windows 7 on drive C:, and windows 8 is on drive F:, then you can run both of these commands from cmd (as administrator):

  1. bcdboot f:\windows (this maps to Windows 8)
  2. bcdboot c:\windows (this re-maps to Windows 7)
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  • Well, that was easy! I just didn't know which keywords to search by. Thank you!
    – Muffin
    Commented Feb 24, 2015 at 13:23

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