[SOLVED] Repair Windows 10 Boot

Discussion in 'Windows 10' started by alessio89g, Sep 7, 2018.

  1. alessio89g

    alessio89g MDL Member

    Jan 20, 2013
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    Hi,
    I've a Dell Optiplex 390 with Win10 installed.
    Yesterday I added a new HDD and I installed WinXP on to it.
    Now Windows XP boot fine, but if I try to boot from the Win10 HDD, it fails and instead boots WinXP HDD.
    I've tried to repair the Windows 10 through a Win10 Installation USB key, both automatic repair and bootrec commands, but seems that it doesn't find any Windows installation.
    How can I do?
     
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  2. z110110

    z110110 MDL Novice

    Apr 15, 2017
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    BOOT.INI Added inside
     
  3. alessio89g

    alessio89g MDL Member

    Jan 20, 2013
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    And so?
     
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  4. alessio89g

    alessio89g MDL Member

    Jan 20, 2013
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    I can't see any BOOT.INI in any HDD (yes, also in hidden files).

    EDIT:
    I found it; I should delete it?
     
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  5. djani

    djani MDL Novice

    Sep 12, 2010
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    #5 djani, Sep 7, 2018
    Last edited: Sep 7, 2018
    If you removed Windows 10 HDD before installing Win XP, the boot loader on Win10 HDD should be OK and you need to enter BIOS/EFI setup utility (usually F2 or Esc key) and change the boot order (to first boot Windows Bootloader, aka Win 10).

    If you installed WinXP on to a second HDD while Win10 HDD was still connected to the machine, Windows XP installation destroyed boot loader for Windows 10.
    In this case boot loader for Win10 can be repaired by executing commands like:
    bootsect {/help|/nt60|/nt52} {SYS|ALL|<DriveLetter>:} [/force] [/mbr]

    Example if your Windows 10 partition is C:
    bootsect /nt60 C: /force /mbr

    If your Win10 HDD was formatted in GPT and your computer uses EFI instead of BIOS, the boot-loader should still be there on the disk without any damage.
    Enter EFI setup and choose "Windows Bootloader" for boot device (to first boot from).

    PS: For bootsect command you will need bootable Windows 10 medium (DVD or USB), also before executing command blindly, check that Windows 10 is C: volume, if it's D, E or any other drive letter, change the bootsect command appropriately.
    If you still have problems booting afterwards, post image of your partition layout (from some HDD partitioning software, of both HDD's) and picture of your BIOS/EFI boot selection screens.

    Edit1: Here is a good article how to repair dual boot system, just see Windows 10 section:
    https :// neosmart.net/wiki/repair-dual-boot-configuration/
     
  6. alessio89g

    alessio89g MDL Member

    Jan 20, 2013
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  7. djani

    djani MDL Novice

    Sep 12, 2010
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    Now that you have your Win10 working again, you should NOT re-install WinXP (if you haven't killed the XP partition already).

    You can only add boot entry to Win10 BCD via BCDedit command.

    After adding boot entry to BCD when computer starts it will ask you to select which OS to load...
    You can even specify the default OS and after how many seconds system should boot to default OS.

    Here are commands (example, haven't tried them myself, so be carefull, make backup of BCD first):
    bcdedit /create {ntldr} /d "Windows XP"

    again you need to know what drive letter is for Win XP partition
    bcdedit /set {ntldr} device partition=E:

    bcdedit /set {ntldr} path \ntldr
    bcdedit /displayorder {ntldr} /addlast

    To backup BCD:
    bcdedit /export X:\BcdBackup\LastBackup

    To restore BCD:
    bcdedit /import X:\BcdBackup\LastBackup

    refs:
    https :// docs.microsoft.com/en-us/windows-hardware/drivers/devtest/adding-boot-entries
    https :// docs.microsoft.com/en-us/windows-hardware/drivers/devtest/changing-boot-parameters
    https :// docs.microsoft.com/en-us/windows-hardware/drivers/devtest/changing-the-default-boot-entry
    https :// docs.microsoft.com/en-us/windows-hardware/drivers/devtest/changing-the-boot-menu-time-out
     
  8. alessio89g

    alessio89g MDL Member

    Jan 20, 2013
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  9. pisthai

    pisthai Imperfect Human

    Jul 29, 2009
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    If everything works fine now, you should add: SOLVED to the title of your thread!
     
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