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Top 4 Methods to Resolve the MBR_CHECKSUM_MISMATCH 0x0000008B Error

2024/08/29
PC Repair

Key Notes

  • Creating a bootable antivirus tool is essential for system scanning.
  • Running a CHKDSK scan can detect and fix file system errors.
  • In extreme cases, a clean installation of Windows may be necessary.

Resolving the MBR_CHECKSUM_MISMATCH Error in Windows

The MBR_CHECKSUM_MISMATCH 0x0000008B error occurs when the Master Boot Record (MBR) checksum reported by the loader does not align with the calculated checksum from the Windows operating system. This issue predominantly arises during system boot and can be a result of virus infections damaging crucial system files. This guide provides step-by-step instructions on troubleshooting and resolving this critical Blue Screen of Death (BSOD) error to restore your computer’s functionality.

How to Fix the MBR_CHECKSUM_MISMATCH 0x0000008B Error

Step 1: Create a Bootable Antivirus Recovery Tool

To begin resolving the MBR_CHECKSUM_MISMATCH error, you need to create a bootable USB drive with reliable antivirus software:

  1. Visit your antivirus provider’s website, such as Norton Antivirus, and download the ISO recovery file.
  2. Click on Download to save the file.
  3. Download Rufus from its official site and install it on your machine.
  4. Launch Rufus and insert the USB drive you wish to use for the recovery tool.
  5. In Rufus, select the USB drive and click on the Select button to choose the downloaded ISO file.
  6. Click Start to begin the process and wait until it shows Ready.

Step 2: Scan Your Computer Using the Bootable USB Drive

Once the bootable USB has been created, follow these steps to utilize it for scanning your system:

  1. Insert the USB drive into the problematic computer and restart it.
  2. Access the BIOS by pressing F2 or Del (depending on your system brand).
  3. Change the boot order to prioritize the USB drive, then save changes and restart.
  4. Choose your preferred language as the bootable antivirus interface loads.
  5. Agree to the terms of service, click Start Scan, and allow the antivirus to complete its scanning process.
  6. If infections are found, click Fix to eliminate threats, then reboot your computer.

Step 3: Perform a CHKDSK Scan

If issues persist, running a CHKDSK scan can help fix any disk errors:

  1. Start your computer and force a shutdown during the boot sequence after the Windows logo appears—do this three times.
  2. On the third restart, you will reach the Windows Recovery Environment (WinRE).
  3. From the options, click Troubleshoot, then select Advanced options and open Command Prompt.
  4. If you can access Windows, search for cmd, right-click it and select Run as administrator.
  5. Type chkdsk /f and press Enter to begin the scan and repair process.
  6. Confirm any prompts, and once completed, restart your PC.

Step 4: Repair the MBR

If the error still occurs, repairing the Master Boot Record may be necessary:

  1. Reboot the computer and again allow it to crash into WinRE using the same method as before.
  2. Access Troubleshoot and navigate to Advanced options > Command Prompt.
  3. In Command Prompt, execute the following command: bootrec /fixboot .
  4. After the operation completes, restart your computer once more.

Step 5: Clean Installation of Windows

If all else fails, a clean installation of Windows may be your last resort:

5.1 Create Installation Media

  1. On another computer, navigate to the Microsoft Windows 11 download page and download the Media Creation Tool.
  2. Run the Media Creation Tool and select USB Flash Drive as the installation location.
  3. Follow the prompts to create a USB bootable installation media.

5.2 Install Windows 11

  1. Plug the USB drive into the affected computer and reboot it.
  2. Access the BIOS to select the USB drive as the boot device.
  3. On the Windows setup screen, choose your language and click Next.
  4. Select Install now, agree to the license terms, and choose Custom: Install Windows only (advanced).
  5. Delete all partitions if required, then follow the rest of the prompts to complete the installation.

5.3 Configure Windows Settings

  1. Upon installation completion, set your region, keyboard layout, and Wi-Fi connection.
  2. Log in with your Microsoft account or create a new one, adjusting privacy settings as needed.
  3. Access Settings by pressing Windows + I and check for updates in the Windows Update section.

Additional Tips

  • Always maintain software and antivirus updates to prevent system errors.
  • Regular file backups can save your data in emergencies.
  • Consider using dedicated cleaning and optimization tools for your system.

Summary

The MBR_CHECKSUM_MISMATCH 0x0000008B error is a serious issue that can prevent your computer from booting. This comprehensive guide provided actionable steps to create a bootable antivirus recovery tool, scan your system, perform a CHKDSK, repair the MBR, and execute a clean install of Windows as a final resort. Following these procedures will help restore your system to normal operation.

Conclusion

Dealing with the MBR_CHECKSUM_MISMATCH error may seem daunting, but effectively following the outlined steps will help you overcome this challenge. Staying vigilant with system updates and practicing regular backups will mitigate future occurrences of such critical errors. If you need further assistance or have queries, feel free to ask.

FAQ (Frequently Asked Questions)

What causes the MBR_CHECKSUM_MISMATCH error?

This error typically arises when the checksum of the Master Boot Record does not match the expected value, often due to malware infections or file corruption.

How can I safely back up my data before fixing the error?

You can back up your data by connecting an external drive or using cloud storage services. Regularly scheduled backups are also recommended to avoid data loss in such scenarios.

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