Sunday, December 01, 2013

How to fix Windows 7/ Win8 boot problem with BCDEDIT



  1. At the Command Prompt, type C:, then dir to make sure the C: drive has Windows folder.
    X:\Sources>C:
    
    C:\>dir
     Volume in drive C has no label.
     Volume Serial Number is 08B5-DD80
    
     Directory of C:\
    
    06/10/2009   01:42 PM                24 autoexec.bat
    06/10/2009   01:42 PM                10 config.sys
    04/09/2013   03:07 AM    <DIR>          Documents
    07/13/2009   06:37 PM    <DIR>          PerfLogs
    04/28/2013   12:59 PM    <DIR>          PortableApps
    04/27/2013   01:12 PM    <DIR>          Program Files
    10/14/2012   12:42 PM           148,376 Start.exe
    04/08/2013   09:39 AM    <DIR>          Users
    04/23/2013   09:02 AM    <DIR>          Windows
                    3 Files(s)       148,410 bytes
                    6 Dir(s)  24,614,199,296 bytes free
    If the C: drive doesn't have "Windows" folder, keep changing to the next letter drive (D:, E:, etc.) until you find a drive that has. Note the letter of this drive (C: in this case).
  2. Type "bcdedit /store C:\Boot\BCD /enum" to show boot entries.
    C:\>bcdedit /store C:\Boot\BCD /enum
    
    Windows Boot Manager
    --------------------
    identifier              {bootmgr}
    device                  unknown
    description             Windows Boot Manager
    locale                  en-US
    inherit                 {globalsettings}
    default                 {default}
    resumeobject            {aaefde36-a035-11e2-85f9-d08a24bd2bde}
    displayorder            {default}
    toolsdisplayorder       {memdiag}
    timeout                 30
    
    Windows Boot Loader
    -------------------
    identifier              {default}
    device                  unknown
    path                    \Windows\system32\winload.exe
    description             Windows 7
    locale                  en-US
    inherit                 {bootloadersettings}
    recoverysequence        {aaefde38-a035-11e2-85f9-d08a24bd2bde}
    recoveryenabled         Yes
    osdevice                unknown
    systemroot              \Windows
    resumeobject            {aaefde36-a035-11e2-85f9-d08a24bd2bde}
    nx                      OptIn
    We should find the lines that have "unknown" values, and correct them by setting the value to "partition=C:" — or whatever drive has "Windows" folder.
  3. To fix the lines with "unknown" values, use bcdedit as follows.
    bcdedit /store C:\Boot\BCD /set {bootmgr} device partition=C:
    bcdedit /store C:\Boot\BCD /set {default} device partition=C:
    bcdedit /store C:\Boot\BCD /set {default} osdevice partition=C:
  4. To verify that corrections were made to the Windows 7 boot configuration, run bcdedit again.
    C:\>bcdedit /store C:\Boot\BCD /enum
    
    Windows Boot Manager
    --------------------
    identifier              {bootmgr}
    device                  partition=C:
    description             Windows Boot Manager
    locale                  en-US
    inherit                 {globalsettings}
    default                 {default}
    resumeobject            {aaefde36-a035-11e2-85f9-d08a24bd2bde}
    displayorder            {default}
    toolsdisplayorder       {memdiag}
    timeout                 30
    
    Windows Boot Loader
    -------------------
    identifier              {default}
    device                  partition=C:
    path                    \Windows\system32\winload.exe
    description             Windows 7
    locale                  en-US
    inherit                 {bootloadersettings}
    recoverysequence        {aaefde38-a035-11e2-85f9-d08a24bd2bde}
    recoveryenabled         Yes
    osdevice                partition=C:
    systemroot              \Windows
    resumeobject            {aaefde36-a035-11e2-85f9-d08a24bd2bde}
    nx                      OptIn
    You can see that "partition=C:" values appear on lines that previously had "unknown" values.
  5. Windows will now boot normally. Close all windows and restart the computer.

1 comment:

JimmyDisco55 said...

Help required plz!! After rolling back from win10 to my original win7, I got "Start up repair cannot repair this computer automatically" error.
After trying numerous checks Ive found my Windows Boot Manager on C: and my windows Boot Loader on E:. Could this be the problem and if so, how can I fix plz?