Dummy with lack of dual boot (win 7/win 10) problem Solved

  1.    05 Dec 2016 #1

    Dummy with lack of dual boot (win 7/win 10) problem

    I have a problem that, surprisingly, I havenít been able to find a solution to by using search on here. Iíve also checked the common problems section, again with no joy. I will loosely detail my system, the events that lead to the problem and then the problem itself.

    I own a 3 hard drive PC. Previously disk zero had Windows XP 32 bit installed, Disk one had Windows 7 32 bit installed and the final hard drive was a data disk shared by both XP and 7. It was a dual boot machine. Incidentally Windows 7 is the full retail version (as opposed to an OEM version which is what XP was).

    As I havenít used XP for quite some time, I decided to install Windows 10 64 bit home (full retail) on that drive to replace XP. My intention being to have a dual boot PC. Having previously set up a dual boot system, I did not anticipate any problems. However when I was installing Windows 10 I did not receive a query asking if I wanted to set up a dual boot system even though I had said I wanted to do a custom install.

    So here is my problem. I now have a machine that boots straight to Windows 10. While it is nice to have a PC that gets to the desktop in under 30 seconds and the disk activity related to booting up ceases in less than two and a half minutes, I really need the ability to access Windows 7 as well as Windows 10.

    What appears to have happened is that during the install process Windows 10 deleted the old BCD that was on disk 1 while leaving the rest of the contents of that drive intact (including all of Windows 7) and created a new BCD on disk zero.

    Am I right in thinking that by editing the BCD on disk zero I would be able to regain a dual boot system again? If so, would someone be willing to give me very detailed instructions on how to go about this. I have downloaded and installed Visual BCD but I really have no idea how to use it. Is this the right tool for the job? Should I use something else?

    Any help or advice will be gratefully received. Thank you in advance.
      My ComputerSystem Spec

  2.    05 Dec 2016 #2

    Welcome to the forum. For duel boot you always have to install the oldest o/s first as it wont reconize the boot for newer o/s.
    we realy need system specs to help are the disk mbr or gpt a screen shot of drives in diskmanger will help
      My ComputerSystem Spec

  3.    05 Dec 2016 #3

    Thanks for replying. I was aware of the need for the older of the 2 OS's to be installed first. That shouldn't have been a problem in this case as win 7 was already installed on its own hard disk before I installed win 10.

    Here is the image from disk manager. As you can see, all 3 drives are mbr. Sorry about getting which drive contained which OS wrong.

    Click image for larger version. 

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    Hope that helps.
      My ComputerSystem Spec

  4.    05 Dec 2016 #4

    Right click start icon. Select Command Prompt (Admin). Run the following command in the command prompt window:

    BCDBOOT D:\Windows /d /addlast

    Restart the computer.
      My ComputerSystem Spec

  5.    06 Dec 2016 #5

    Thank you. That worked a treat. One little thing though. Right clicking on the start icon only brought up a small menu of 4 items none of which were for the administrator command prompt. Fortunately a quick search on google provided a solution. Simultaneously pressing both the Windows key and 'X' brought up a menu that had Command Prompt (Admin) on it.

    So thanks to you I now have a win 10/win 7 dual boot system.
      My ComputerSystem Spec


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