Windows 10: Adding MBR to existing windows installation former dual boot.

Discus and support Adding MBR to existing windows installation former dual boot. in Windows 10 Installation and Upgrade to solve the problem; I had a dual boot set up with Windows 7 on one SSD and Windows 10 on another seperate SSD. Unfortunately the Windows 7 SSD has died taking with it the... Discussion in 'Windows 10 Installation and Upgrade' started by JJJon4, Sep 14, 2020.

  1. JJJon4 Win User

    Adding MBR to existing windows installation former dual boot.


    I had a dual boot set up with Windows 7 on one SSD and Windows 10 on another seperate SSD. Unfortunately the Windows 7 SSD has died taking with it the MBR so I now get a 'An operation system wasn't found' message when booting up the computer. Is there an easy way to add a MBR to the windows 10 SSD so I can get my computer working again without doing a fresh install.

    :)
     
    JJJon4, Sep 14, 2020
    #1

  2. windows xp installation and dual core am

    could someone please list the steps they follow to install windows with a dual core processor and windows xp service pack to. I'm reletively new to amd dual core and i feel i'm missing a step. All help will be appreciated. thanx
     
    exodusprime1337, Sep 14, 2020
    #2
  3. topgundcp Win User
    Dual Booting 2 x Windows 10 OS Drives (Existing Installs)


    It is uneccessary to do all of the above.
    1. Boot up Windows 10
    2. Open Disk Management and take a note of the drive letter of the other Windows 10
    3. Open Admin Command Prompt and type: bcdboot X:\Windows where X is the drive letter noted in step 2
    4. Reboot, you should have a dual boot menu.
     
    topgundcp, Sep 14, 2020
    #3
  4. topgundcp Win User

    Adding MBR to existing windows installation former dual boot.

    Dual Booting with Windows 8.1


    The procedure below will allow you to boot Windows separately or in dual boot configuration.
    Here's what I recommend to do:
    1. Disconnect the drive containing Windows 8.1
    2. Install Windows 10 with one drive connected.
    3. After step 2, reconnect the drive containing Windows 8.1
    4. Boot up Windows 8.1. Open disk management and take a note of the drive letter of Windows 10 OS.
      NOTE: if you boot up Windows 10, then take a note of Windows 8.1 drive letter
    5. Open Admin command prompt and type: bcdboot X:\windows where X: is the drive letter of Windows 10 (Windows 8.1 if you boot from Windows 10 in step 4)
    6. Reboot the PC. You should have a dual boot screen.

    NOTE: To break off the dual boot setting, Win+R->msconfig->boot and delete the none default entry on the list.
     
    topgundcp, Sep 14, 2020
    #4
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Adding MBR to existing windows installation former dual boot.

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