This guide is about how to fix bad system config info blue screen / The Boot Configuration Data file is missing error on Windows 10. We have received a query from our forum user. Also few Windows users reported on Microsoft community as they are unable to boot into Windows. Unfortunately Windows is not loading due to BCD files or Windows boot files are corrupted. When BCD files are corrupted. Your computer may reboots with blue screen error, Windows does not load operating system, blue screen when power on the computer, startup bad system config info blue screen error.
Your computer may not boot into Windows as it does not find BCD registry file or it has corrupted. You see error as Your PC needs to be repaired, The Boot Configuration Data file is missing. File:BCD, Error code:0x0000034.
What is BCD (Boot configuration Data)
The BCD registry file replaces the Boot.ini files that used in Windows XP and earlier versions of Windows to trace operating system locations, and it enables new features on Windows Vista and later Windows operating systems, including the Startup Repair tool. The BCD is stored in a data file it uses the registry format and located on either the Extensible Firmware Interface (EFI) system GUID partition (for computers that support EFI) or on the system volume. On BIOS-based operating systems, the BCD registry file is located at \Boot\Bcd on the active partition. On EFI-based operating systems, the BCD registry file is located in the \EFI\Microsoft\Boot\ folder.
What type of information includes in BCD registry file?
- Windows Boot Manager (\Bootmgr) settings.
- Allows to start the Windows Boot Loader (\Windows\System32\WinLoad.exe), which can then load Windows Vista
- Options to start Windows Resume Application (\Windows\System32\WinResume.exe), it can then restore Windows Vista from hibernation
- Options start Windows Memory Diagnostic (\Boot\MemTest.exe)
- Options to start Ntldr to load previous versions of Windows
- Options to load and execute a Volume Boot Record, which typically starts a non-Microsoft boot loader
- It can also load third party loaders like recovery tools.
What is causing bad system config info blue screen error.
- The Windows Boot Manager (Bootmgr) entry is not present in the Boot Configuration Data (BCD) store.
- The Boot\BCD file on the active partition is damaged or missing.
How to fix bad system config info blue screen error / The Boot Configuration Data file is missing startup error.
Windows should able locate the BCD file to startup or boot into Windows, if does not you will end up with error “The PC needs to be repaired”. BCD files m ay not be located or accessible due to several reasons. Like BCD registry files is corrupted, BCD registry permissions corrupted due to wrong configuration anti-virus or corrupted anti-virus. To make sure anti-virus is not causing the issues and BCD files is corrupted. Reboot the computer in Safe Mode, if you are able to reboot the computer in safe mode, BCD files okay and working fine. You just need to reinstall or uninstall anti-virus software from your computer. If you are unable to reboot your computer you may have to rebuild or repair BCD files.
Perform Boot Clean Boot
If you are able to reboot the computer in safe mode, perform clean boot and uninstall anti-virus software.
- Press Windows + R at same time. Type msconfig. Click on OK.
- On General tab, Uncheck Load start up items.
- On Services tab. Click on Hide all Microsoft services. Click on Disable all. Click OK
- Uninstall anti-virus now.
Uninstall anti-virus software
Follow below links to disable, uninstall or reinstall antivirus software from your computer
- How to temporarily disable any antivirus firewall
- Remove-reinstall Norton anti-virus using Norton removal tool
- Completely uninstall AVG products
- Disable Windows Defender in Windows 8/10
- Turn Windows Defender on or off in Windows 8
- Turn Windows Defender on or off in Windows 7
List of manual antivirus uninstallers:
Click the link associated with the antivirus software currently installed on your system and follow the prompts or instructions on the website.
Once uninstallation is complete, you will need to restart your computer.
- CA Antivirus
- Comodo Internet Security
- Cyber Defender Early Detection Center
- Dr. Web : (Only registered Dr.Web users can access support content)
- FRISK F-PROT Antivirus for Windows
- G Data
- K7 Total Security
- Microsoft Security Essentials
- Norman Virus Control/Norman Security Suite
- Norton (Symantec)
- Norton Security Scan
- Panda Cloud Internet Protection
- Pareto Logic
- Spybot Search & Destroy
- Total Defense Anti-Virus (formerly CA Anti-Virus)
- Trend Micro
- Trend Micro Titanium
- Trend Micro Worry-Free Business Security Agent
- Vipre (Sunbelt Software)
- Windows Defender
- Windows Live OneCare
- Windows Security Essentials
- Zone Alarm
Repair BCD file.
To repair BCD files you should have Windows installation media with you. If you have the one insert it (assuming you have USB bootable media). If not create the one from this guide create bootable USB-DVD media from ISO for Windows 10
1. Insert Windows installation disk or USB into the computer.
2. Boot to the installation media. Usually by pressing F12 you can go to boot menu. Check boot menu shortcut keys for all computer models.
3. Select Language, Time and Keyboard format and Click Next on the Windows Setup screen.
4. Click Repair your computer.
5. Choose Troubleshoot.
6. Select Advanced options.
7. Click Command Prompt.
bootrec /repairbcd (The command finds missing operating systems on the BCD and links them)
bootrec /osscan (This command looks for installed operating systems.)
bootrec /repairmbr (This command wipes the MBR and recreates it using information from the BCD.)
Fix the Windows Registry
- Use the following command:
CD C:\Windows\System32\config (here C is the partition where Windows is installed).
- Enter the following commands one by one to rename these files with the .old postfix:
ren C:\Windows\System32\config\DEFAULT DEFAULT.old
ren C:\Windows\System32\config\SAM SAM.old
ren C:\Windows\System32\config\SECURITY SECURITY.old
ren C:\Windows\System32\config\SOFTWARE SOFTWARE.old
ren C:\Windows\System32\config\SYSTEM SYSTEM.old
- Enter the following commands one by one to copy registry backup files to your current registry folder. This completes the manual restoration of your computer’s registry.
- copy C:\Windows\System32\config\RegBack\DEFAULT C:\Windows\System32\config\
- copy C:\Windows\System32\config\RegBack\SAM C:\Windows\System32\config\
- copy C:\Windows\System32\config\RegBack\SECURITY C:\Windows\System32\config\
- copy C:\Windows\System32\config\RegBack\SYSTEM C:\Windows\System32\config\
- copy C:\Windows\System32\config\RegBack\SOFTWARE C:\Windows\System32\config\
Clean install Windows
If above resolutions steps does not work, perform clean installation. Make sure you have your data and applications license back as reinstallation will erase everything. Clean Install Windows 10 from USB Bootable Media
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