By Ailsa / Last Updated January 16, 2020

The symptom

I have some trouble with my computer that is running Windows 10. When I try to start it, I get a blue screen with the error “Recovery Your PC needs to be repaired The Boot Configuration Data for your PC is missing or contains errors. File:\EFI\Microsoft\Boot\BCD Error code: 0xc0000034”. I have no idea what to do and how to fix it?

According to the words, you may have a general idea of the error. It means that your Boot Configuration Data (BCD) is corrupted in your Windows PC. The Boot Configuration Data is a firmware-independent database for boot-time configuration data, which used by Microsoft’s new Windows Boot Manager and replaces the boot.ini that was used by NTLDR. Boot Configuration Data is stored in a data file, which is located at \EFI\Microsoft\Boot\BCD on the EFI system partition for UEFI boot or located at /boot/bcd on the active partition for traditional BIOS boot.

The causes to EFI Microsoft Boot BCD error

The EFI\Microsoft\Boot\BCD error may occur after installing Service Pack 1 for Windows 7, hardware or software change, or other inappropriate operation, malware and so on. You may meet other error codes for File:\EFI\Microsoft\Boot\BCD, like error code 0xc00000f, 0xc00000d, etc. Now, how to fix it?

How to deal with File:\EFI\Microsoft\Boot\BCD Error?

The EFI Microsoft Boot BCD error could be repaired by different ways in Windows 7/8/10.

Use Bootrec.exe tool to do EFI\Microsoft\Boot\BCD fix

This solution needs a Windows 10/8/7 installation disc. Then follow the below steps to repair:

1. Insert the Windows installation disc into the computer and then boot the PC.

2. Press a key when you are prompted.

3. Select a language, a time, a currency, a keyboard, click Next.

4. Click Repair your computer.

5. Choose the operating system you want to repair and click Next.

6. Choose Troubleshoot>Advanced options>Command Prompt to execute following commands:

• Bootrec /fixmbr
• Bootrec /fixboot
• Bootrec /scanos
• Bootrec /rebuildbcd
• Exit

Startup Repair

You could try startup repair if the bootrec.exe tool not working. The steps are listed below:

  • Boot from the Windows7/8/10 installation disc (CD or DVD) and click Repair your computer.

  • Choose Startup Repair on the System Recovery Options window.

Then wait for the result. The error could be solved.

Rebuild MBR to fix corrupted BCD

If you don’t have a Windows 7/8/10 installation disc, you might have to create a WinPE bootable media with a normal PC to boot your computer from it, then repair EFI\Microsoft\Boot\BCD error in Windows 7/8/10. The best free disk partitioning software, AOMEI Partition Assistant Standard is recommended. The freeware is capable of managing disk partition such as resize partition, merge partitions, format/split/move partition, rebuild MBR, migrate OS to SSD, etc.

Before you do:

  • Prepare a USB flash drive at least 16GB.

  • A normal computer with the same Windows operating system as yours.

  • Download the freeware.

Here is how to rebuild MBR safely in Windows 7/8/10 with simple steps:

1. Put the USB flash drive to your Windows 7/8/10 PC. Run and open AOMEI Partition Assistant Standard, choose Make Bootable Media at the left hand panel. Click Next.

Make Bootable Media

2. Tick USB Boot Device.

Choose USB Drive

4. Click Proceed.

5. Then boot your computer which has the File:\EFI\Microsoft\Boot\BCD error from the bootable media. AOMEI Partition Assistant Standard will execute automatically then.

6. Select Rebuild MBR.

Rebuild System Disk MBR

7. Choose the MBR type for your Windows operating system. Hit OK.

Choose MBR Type

8. Click Apply.

After that, the windows BCD error should be resolved. What’s more, you could enjoy the advanced functions such as allocate free space from one partition to another, convert system disk between MBR and GPT without losing data, command line partitioning, etc with AOMEI Partition Assistant Professional. Or you could try the Server edition if you are a server user with all the advanced functions.