Windows 10: Partition locked - tried to install x64 Win 10 (bootmgr missing) Solved

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  1. Posts : 11
    Windows 10 32 bit
       06 Oct 2015 #1

    Partition locked - tried to install x64 Win 10 (bootmgr missing)


    Hi folks,

    As IE11 was malfunctioning, and my GT610 driver doesn't seem to work properly in Win10 32 bit, I attempted to upgrade to Win 10 x64 on my machine (Dual core, 64 bit ready, 4GB ram), and whilst doing so I think I've deleted the C:\ boot partition. I had partitioned the C drive and put the data in F:\ drive partition before hand so I didn't lose all my data.

    When rebooting, I got the message "bootmgr is missing", so tried to boot from a Win 10 32bit iso DVD. I can get the DVD to launch, and tried to go through a repair, but got the message that the drive/partition was locked. I can't repair it, or boot.
    I also tried fixing it using Minitool Partition Wizard, which shows the partition without a label and as "unformatted". wasn't sure whether I should format the partition or not.

    Can you please suggest what I can do, to unlock the drive (from command prompt?) and then reinstall or repair Win 10.

    Can I keep the F:\ partition with the data on it whilst doing an install of the x64 bit windows, or will I have to reformat the whole disk because of the different architecture?

    Thanks
      My ComputerSystem Spec


  2. Posts : 9
    Windows 7 (x64) / Ubuntu 14.04 (x64)
       06 Oct 2015 #2

    The answer here is very simple.You have deleted your boot partition so I guess the partitioning proccess has been made well.
    The solution here is to rewrite the bootloader files to your OS partition to make your system bootable again.

    1) Boot your Windows 10 Setup from a DVD or USB Drive (or Stick).(Windows 7/8 dvds could make this trick also for this proccess)
    2) As long as you see the install screen press shift+F10.This should open you a command prompt.
    3) After that you have to reinstall your bootloader (probably to your C:\ partition).Use the command

    cd {the drive letter of your boot device}:\boot

    in order to move to the specific folder path so you can find bcdboot.exe.
    Example: If your dvd drive letter is E: the command is
    cd E:\boot

    You should also use the command

    {the drive letter of your boot device}:

    in order to move to the specific partition.

    Example: According to the previous example the command is
    E:

    (If you type the command "dir" you should be able to see a bcdboot.exe in your printed results)

    4)You are ready to proceed to bootloader installation.If your Windows partition with the OS is on drive C: use the command

    bcdboot c:\windows /s c:

    If you steel have problem you probably have to make your system partition active.
      My ComputerSystem Spec


  3. Posts : 9
    Windows 7 (x64) / Ubuntu 14.04 (x64)
       06 Oct 2015 #3

    I didn't totally understand the issue.I am a little confussed about how did you make the partition proccess because C: drive shouldn't be your boot partition (actually it shouldn't have some letter).
    I didn't also understand if you made a clean install from 32-bit to 64-bit or an actual upgrade.If you changed the architecture you should have make a clean install of the OS.
      My ComputerSystem Spec


  4. Posts : 11
    Windows 10 32 bit
    Thread Starter
       06 Oct 2015 #4

    Jimysbil said: View Post
    The answer here is very simple.You have deleted your boot partition so I guess the partitioning proccess has been made well.
    The solution here is to rewrite the bootloader files to your OS partition to make your system bootable again.

    1) Boot your Windows 10 Setup from a DVD or USB Drive (or Stick).(Windows 7/8 dvds could make this trick also for this proccess)
    2) As long as you see the install screen press shift+F10.This should open you a command prompt.
    3) After that you have to reinstall your bootloader (probably to your C:\ partition).Use the command

    cd {the drive letter of your boot device}:\boot

    in order to move to the specific folder path so you can find bcdboot.exe.
    Example: If your dvd drive letter is E: the command is
    cd E:\boot

    You should also use the command

    {the drive letter of your boot device}:

    in order to move to the specific partition.

    Example: According to the previous example the command is
    E:

    (If you type the command "dir" you should be able to see a bcdboot.exe in your printed results)

    4)You are ready to proceed to bootloader installation.If your Windows partition with the OS is on drive C: use the command

    bcdboot c:\windows /s c:

    If you steel have problem you probably have to make your system partition active.
    Thanks.

    Just to note that in command prompt, I can see the "X" drive, but it cannot find C. It appears to be missing.
    I'll try your suggested fix.
      My ComputerSystem Spec


  5. Posts : 9
    Windows 7 (x64) / Ubuntu 14.04 (x64)
       06 Oct 2015 #5

    If you cannot find the drive C: could mean your partition is destroyed.If this happens you can try to run a chkdsk to the specific partition.
    For this step you have to use diskpart to assign your destroyed partition as drive C.
    Boot you Windows setup and use the following commands
    diskpart
    list disk --> this command will appear all the disks on your pc with a number.
    select disk {number of the disk}
    list partition --> this command will appear every partition on your selected disk with a number.
    select partition {number of partition}
    assign letter=C
    exit

    After that you should be able to use chkdsk to restore your destroyed partition.As long as you have mount your system partition to letter C use the command

    chkdsk \r \f \x c:

    Let the command run.This command should detouch and force repair your sytem partition.
      My ComputerSystem Spec


  6. Posts : 4,633
    Win10 Home and Pro, Win10 Insider Preview, WinXP Home Premium, Linux Mint
       06 Oct 2015 #6

    Another possibility that I have used is to download the GPARTED .iso file to another computer, use the CD Burning program to create a bootable CD then boot to it to view the partition/s. If there is unallocated space a new partition can be created in it then have a choice to format. If the C: partition has an issue it should be possible to delete it to start over. But as always, BE CAREFUL.
    http://gparted.sourceforge.net/
      My ComputerSystem Spec


  7. Posts : 11
    Windows 10 32 bit
    Thread Starter
       06 Oct 2015 #7

    Jimysbil said: View Post
    If you cannot find the drive C: could mean your partition is destroyed.If this happens you can try to run a chkdsk to the specific partition.
    For this step you have to use diskpart to assign your destroyed partition as drive C.
    Boot you Windows setup and use the following commands
    diskpart
    list disk --> this command will appear all the disks on your pc with a number.
    select disk {number of the disk}
    list partition --> this command will appear every partition on your selected disk with a number.
    select partition {number of partition}
    assign letter=C
    exit

    After that you should be able to use chkdsk to restore your destroyed partition.As long as you have mount your system partition to letter C use the command

    chkdsk \r \f \x c:

    Let the command run.This command should detouch and force repair your sytem partition.

    HI
    thanks. I tried the disk part instructions, and now I get "missing operating system" when I try and boot. When I go to windows advanced repair options (from the WIn10 32 bit ISO DVD), and try and repair it, it says that the drive is locked.

    :-(

    I'm having a go at partition repair using the Minitool Partition Wizard. In this I can see my data partition (F) and an unformatted partition with a *, which looks like it was my C: drive. Not sure whether to delete this partition.
      My ComputerSystem Spec


  • Posts : 11
    Windows 10 32 bit
    Thread Starter
       07 Oct 2015 #8

    Hi again.

    I've used Minitool Partition wizard to recreate several partitions. It has created 12 partitions. When I look at them through the Command Prompt (using the Win10 iso DVD), drive C: has a number of files including flash.bat, himem.sys, but nothing clearly about booting the computer.

    Thanks again,
    Last edited by siboli; 07 Oct 2015 at 03:27. Reason: incorrect info
      My ComputerSystem Spec


  • Posts : 4,633
    Win10 Home and Pro, Win10 Insider Preview, WinXP Home Premium, Linux Mint
       07 Oct 2015 #9

    siboli said: View Post
    Hi again.

    I've used Minitool Partition wizard to recreate several partitions. It has created 12 partitions. When I look at them through the Command Prompt (using the Win10 iso DVD), drive C: has a number of files including flash.bat, himem.sys, but nothing clearly about booting the computer.

    Thanks again,
    Shades of Windows 9x and DOS days, himem.sys seems to be out of place.
      My ComputerSystem Spec


  • Posts : 11
    Windows 10 32 bit
    Thread Starter
       07 Oct 2015 #10

    RIGHT! Fixed. I used Minitool partition wizard to identify unallocated space on the hard drive, and formatted it, then gave it a name. I then went through the installation (not repair) process using the DVD iso disk, and selected this partition as the place to install windows, and .... it worked! I have kept my data as it was in a separate partition and installed the OS in a separate one.
      My ComputerSystem Spec


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