Use BCD Repair Tool for Windows 11/10 to Fix Boot Errors

A bootable BCD repair tool can scan Windows boot entries and repair damaged Boot Configuration Data even when the computer cannot start. You can use AOMEI Partition Software for visual repair, try Windows Startup Repair, or rebuild the boot files with Bootrec and BCDBoot.

When Do You Need a BCD Repair Tool?

The Boot Configuration Data store tells Windows Boot Manager where Windows is installed and how it should start. If this data is missing, damaged, or linked to the wrong partition, the computer may enter Recovery, Automatic Repair, or a restart loop.

A BCD problem may display messages such as “The Boot Configuration Data file is missing or contains errors,” “A required device isn’t connected or can’t be accessed,” or “The operating system couldn’t be loaded.” Common error codes include 0xc000000f, 0xc0000098, and 0xc000014c.

These symptoms often appear after an interrupted update, an incorrect partition change, boot-disk replacement, or damage to the EFI System Partition. However, not every startup failure is caused by BCD. A failing drive, missing Windows partition, incorrect UEFI or Legacy mode, and damaged system files require different repairs.

Method 1. Use AOMEI Partition Software to Create and Run the Bootable BCD Repair Tool

Command-based BCD repair requires you to identify the Windows partition, system partition, firmware mode, and correct command syntax. AOMEI Partition Software provides a visual Boot Repair feature that scans boot entries and shows which entries can be repaired.

The software can display the detected system path, Windows version, boot status, and repair status. It also lets you create bootable Windows PE media on another computer, which makes it suitable when the affected PC cannot enter Windows or its recovery options.

You need a working Windows computer and an empty USB drive before starting. The USB drive will be formatted during bootable media creation, so move its files elsewhere first.

Step 1. Install and open AOMEI Partition Software on a working computer. Connect the USB drive and go to Make bootable media.

Step 2. Follow the prompts to create the Windows PE repair media. Confirm that the correct USB device is selected before proceeding.

Step 3. Insert the bootable USB into the computer with the BCD error. Open its Boot Menu or firmware settings, then select the USB drive as the temporary startup device.

Step 4. After the repair environment loads, Boot Repair scans the connected disks for Windows systems and boot entries. Review the system path, Windows version, and boot status shown in the results.

Step 5. Select the repairable Windows entry and click Repair. Repairing the entry on its original system disk is the recommended choice in most cases.

When the operation finishes, remove the USB drive and restart the computer from its internal disk. An encrypted system disk may need to be unlocked or decrypted before it can be selected. If the repair succeeds but Windows still does not start, check the boot order, firmware mode, disk health, and Windows partition.

Method 2. Run Windows Startup Repair

Windows Startup Repair can detect and correct several startup faults, including damaged BCD data, missing boot files, and some system-file problems. It is worth trying when Windows Recovery Environment remains accessible.

Step 1. Enter Windows Recovery Environment and select Troubleshoot > Advanced options > Startup Repair.

Step 2. Choose the affected Windows installation and enter the BitLocker recovery key if requested.

Step 3. Allow Windows to complete the diagnosis and restart the computer.

If Windows cannot open Recovery, you can enter the same options from Windows installation media. Startup Repair may report that it could not repair the PC when the problem involves disk damage, an incorrect partition layout, or a boot configuration it cannot reconstruct.

Method 3. Rebuild BCD with Bootrec and BCDBoot

Bootrec can scan for Windows installations and rebuild the BCD store, while BCDBoot can recreate the boot environment from an existing Windows installation. Check every drive letter in WinRE before running these commands because the letters may differ from those shown in normal Windows.

Step 1. Find the Windows Partition. Identify the volume containing the Windows folder. Do not continue with a copied command until you have confirmed the correct letter.

Step 2. Open Command Prompt from Troubleshoot > Advanced options, and run:

diskpart

list volume

exit

Then check likely drive letters:

dir C:\Windows

dir D:\Windows

dir E:\Windows

The correct volume should contain folders such as System32, WinSxS, and Boot. The examples below use D: as the Windows partition, but you must replace it with the letter found on your computer.

Step 3. Scan for Windows and Rebuild BCD

Bootrec can search for installations that are not represented correctly in the current BCD store. Run the scan before attempting the rebuild.

bootrec /scanos

bootrec /rebuildbcd

If Windows is found, type Y to add it to the boot list. If the result says Total identified Windows installations: 0, it does not prove that Windows has been deleted. Recheck the Windows partition and use BCDBoot to recreate the required boot files.

Do not run bootrec /fixmbr or bootrec /fixboot automatically. The first command targets MBR boot code, while most Windows 11 systems use UEFI and GPT. The second may return “Access is denied” on UEFI systems and does not directly rebuild the BCD store.

Step 4. Recreate UEFI Boot Files with BCDBoot

On a UEFI computer, BCDBoot can copy new boot files to the EFI System Partition and create a fresh Windows Boot Manager entry. You must identify the correct EFI partition instead of guessing based only on its size.

Run:

diskpart

list volume

Look for the FAT32 system volume, then assign it a temporary letter:

select volume N

assign letter=S

exit

Replace N with the correct volume number. If Windows is on D:, run:

bcdboot D:\Windows /s S: /f UEFI

Restart the computer after the boot files are created. A Legacy BIOS/MBR installation may require /f BIOS and the correct System Reserved partition, but that should not be used as the default for a Windows 11 computer.

Common BCD Repair Errors

The result of a BCD command often points to an incorrect partition choice rather than a missing Windows installation. Use the message to decide what to check next.

Message or result	What to do
Total identified Windows installations: 0	Confirm the real Windows drive letter in WinRE. If the Windows folder exists, recreate the boot files with BCDBoot.
bootrec /fixboot: Access is denied	Stop repeating the command. Identify the EFI System Partition and use BCDBoot with the correct Windows and EFI letters.
Failure when attempting to copy boot files	Check the Windows source path, EFI partition letter, BitLocker status, and file-system condition.
Repair completed, but Windows still will not boot	Check the boot order, UEFI or Legacy setting, disk health, Windows partition, and system files.

Ending

AOMEI Partition Software is a practical BCD repair tool when you need visual scanning or bootable recovery media. Windows Startup Repair is suitable for a quick automatic attempt, while Bootrec and BCDBoot provide manual control after the correct Windows and system partitions have been identified.

FAQs

The following answers cover common questions about choosing and using a Windows 11 BCD repair tool. They also clarify what BCD repair can and cannot change.

1. What Is the Best BCD Repair Tool for Windows 11?

AOMEI Partition Software is suitable for users who want a visual, bootable repair process without entering partition-specific commands. Windows Startup Repair and BCDBoot are built-in alternatives, but manual repair requires accurate drive letters and UEFI partition identification.

2. How Do I Rebuild BCD in Windows 11?

Enter Windows Recovery Environment and try Startup Repair first. For manual repair, identify the Windows partition, run bootrec /scanos and bootrec /rebuildbcd, or use BCDBoot to recreate UEFI boot files when Bootrec does not find the installation.

3. Does Rebuilding BCD Delete Personal Files?

Rebuilding BCD changes startup configuration and should not delete personal files stored on the Windows partition. Still, selecting, formatting, or modifying the wrong system partition can create new boot problems, so verify all disk and volume numbers before running commands.