dual boot issue


  1. Posts : 3
    Windows 7 pro x64
       #1

    dual boot issue


    Hi

    I have an existing win 7 install and have attempted to install win 10 on a separate physical disk.
    I was hoping to dual boot both os's but I do not receive the option.
    Instead the system takes me to win 10 by default.
    I'm assuming the boot loader has been changed.
    Any ideas how I can get back into win 7 once more?

    Thanks
      My Computer


  2. Posts : 6,330
    Multi-Boot W7_Pro_x64 W8.1_Pro_x64 W10_Pro_x64 +Linux_VMs +Chromium_VM
       #2

    Post a maximized/resized screen print of Disk Management using these instructions:
    Disk Management - Post a Screen Capture Image
      My Computer


  3. Posts : 3
    Windows 7 pro x64
    Thread Starter
       #3

    dual boot issue-diskmgmt.png

    This is taken from within win 10 so the drive letter assignments will be a tad off
      My Computer


  4. Posts : 6,330
    Multi-Boot W7_Pro_x64 W8.1_Pro_x64 W10_Pro_x64 +Linux_VMs +Chromium_VM
       #4

    Run msconfig and look at the boot tab.
    Do you have Windows 7 and Windows 10 listed ?
    What is your timeout setting ?

    Here's an example of the msconfig boot tab.
    I'm running 8.1 right now, but 7 and 10 are pretty much the same.

    dual boot issue-msconfigboot.png
      My Computer


  5. Posts : 6,330
    Multi-Boot W7_Pro_x64 W8.1_Pro_x64 W10_Pro_x64 +Linux_VMs +Chromium_VM
       #5

    It might be Win 10 fast startup that is causing the problem.

    Go to Control Panel > Power Options
    Click on Choose what the power buttons do
    Make sure Turn on fast startup is uchecked
      My Computer


  6. Posts : 3
    Windows 7 pro x64
    Thread Starter
       #6

    I have surprised myself and managed to resolve the issue.
    But thanks to you DavidE as your suggestion around disk mgmt got me thinking about the master boot record.
    I had to boot up with a command prompt and use bootrec /rebuildbcd. This searches for all win installations and displays the ones not listed in the boot config store and gives you the option of adding them.
    On boot up I now get asked which version I want.
    Sorted
    Thanks again
      My Computer


  7. Posts : 6,330
    Multi-Boot W7_Pro_x64 W8.1_Pro_x64 W10_Pro_x64 +Linux_VMs +Chromium_VM
       #7

    That's great !

    Make sure you do turn off fast startup in Win 10, that can cause problems for Win 7.

    Here is a tutorial:
    Fast Startup - Turn On or Off in Windows 10 - Windows 10 Forums
      My Computer


  8. Posts : 13,576
    Windows 10 Pro x64
       #8

    A better way would have been to unplug all other drives when you installed 10, then just used the boot menu to boot into 10 when you wanted to.

    That way your drives would have been independent of each other, should you want to stop using Windows 7, God forbid
      My Computer


 

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