Windows 10: Windows 10 can't find its own bootloader in dual-boot setup

Discus and support Windows 10 can't find its own bootloader in dual-boot setup in Windows 10 Support to solve the problem; Hello, so I have a pretty weird issue with my Manjaro Linux and Windows dual boot setup. I had a perfectly working setup on my 1TB SSD, where both... Discussion in 'Windows 10 Support' started by knur123, Sep 29, 2019.

  1. knur123 Win User

    Windows 10 can't find its own bootloader in dual-boot setup


    Hello, so I have a pretty weird issue with my Manjaro Linux and Windows dual boot setup. I had a perfectly working setup on my 1TB SSD, where both Linux and Windows occupied half of the drive, UEFI was set to boot to Windows, but Windows bootloader was set to GRUB by bcdedit command. Everything was working well, I could update Windows normally. Then I wanted to resize Windows and Linux partitions to be 750/250 GB respectively, so I live booted to Linux live environment (Manjaro KDE from USB drive) and ran KDE Partition Manager. I resized both partitions, but the computer couldn't recognize either of bootloaders so it wouldn't load either system. To fix this, I live booted to Manjaro again and used testdisk command and it fixed my partition table. After this, I couldn't boot to Windows (even though EFI partition was intact), but I could boot to Linux. In Linux, update-grub command couldn't recognize my Windows installation so I booted my PC from Windows 10 installation disk. I had to rebuild my EFI partition through bcdboot command. I specified the path to be on /dev/sda7, the partition with Linux bootloader. This did help, but didn't fix every issue. I had two Windows entries in my UEFI boot menu, but only one of them (the new one) was working. Then I added Windows entry manually to GRUB and it's working somehow, but Windows doesn't recognize its own EFI partition ("The configuration data store could not be opened.") and now Windows Updates are broken ("Windows is reverting updates"). After that, I formatted the old 100 MB EFI partition and removed the old boot entry using efibootmgr command.
    So, summarizing:
    • After I turn on my PC, GRUB is loaded and I can either boot to Linux or chainload Windows 10 bootloader
    • I can boot to Windows via GRUB or UEFI boot menu
    • Even though Windows boots normally, it doesn't know where its bootloader is located
    • It's not possible to update Windows

    I'm attaching output of some commands to help troubleshoot the issue:

    Code:
    Code:
    Code:
    Also, here's output from tree command of my dev/sda7 EFI partition:
    Code:
    I hope it's possible to solve this issue without reinstalling both systems. Thank you in advance!
    Also, please tell me if you need to know output of some other command

    :)
     
    knur123, Sep 29, 2019
    #1

  2. Windows 10 USB boot

    Hi there, am not a windows 10 expert. I have a pc in the bedroom on windows 10, I messed up the bootloader trying to fix the xp on that system.

    System wont boot, trying to repair via win 10 usb installer.

    Downloaded the media creation tool to install windows 10 installer on usb stick. Not compatible with a host of usb sticks I have. Tried the usb sticks that others use, but I think they use rufus; as the media creation tool by win 10 does not detect the usb stick.

    So quick question, the win10 machine i am trying to repair the bootloader is a win7 upgraded to win10.
    If i were to use the usb win10 installer to "repair installation" does the version of the iso downloaded via the media creation tool matter?

    There is three options:
    Windows 10
    Windows 10 Home
    Windows 10 N

    Also is there a step by step instead of using rufus as I want to try an alternative method of creating a usb win 10 installer. Preferably with more compatibility.

    System is a asus sabertooth 990 (r2?) with AMD phenom X 6.

    Also is there any other software I can load onto the usb that can repair the bootloader easily?
    That would be the ideal alternative. Thanks
     
    TRUELOVE95, Sep 29, 2019
    #2
  3. Windows 10 Doesn't Boot

    Provided both OSes main partitions are still there, it's always possible to recreate the windows bootloader and the grub bootloader, one after the other.

    If it's a matter of recreating your windows bootloader from scratch, here's how to do it.

    From your Windows DVD / usb key, drop into console and follow those instructions:

    You should be good to go, Windows 10 should boot properly.

    Later you can reinstall the grub2 bootloader from a live CD, and let it manage the dualboot for you. This has been discussed here : https://www.techpowerup.com/forums/...-win-7-machine-dual-boot.209395/#post-3229778
     
    blobster21, Sep 29, 2019
    #3
  4. topgundcp Win User

    Windows 10 can't find its own bootloader in dual-boot setup

    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 29, 2019
    #4
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Windows 10 can't find its own bootloader in dual-boot setup

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