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How to Fix MBAMSwissArmy.sys Boot Error on Windows 11: Step-by-Step Solutions

If you are encountering a boot error related to MBAMSwissArmy.sys on your Windows 11 PC, you are not alone. This file is linked to Malwarebytes, a popular security program, and issues with it can prevent your computer from starting properly.

Fixing this error might seem complicated, but with the right steps, you can resolve it without needing advanced technical knowledge. This guide will walk you through simple, clear solutions to get your system running smoothly again.

Each step is explained in detail, so even if you are new to troubleshooting Windows, you can follow along easily. Let’s get started with the basics before diving into more technical fixes.

By the end, you’ll understand why this error happens and how to prevent it in the future.

Quick Note Before You Start

  • Make sure your PC is plugged in and has a stable power source during troubleshooting.
  • Have basic knowledge of using Windows Recovery Environment (WinRE) or access to a Windows 11 installation media (USB/DVD) if needed.
  • Backup important data if you have access to your system or use another device to prepare a recovery drive.
  • Ensure Malwarebytes or any antivirus software is updated regularly to avoid conflicts.

Step 1: Boot into Safe Mode

Safe Mode starts Windows with only the essential drivers and services. This helps isolate if MBAMSwissArmy.sys is causing the boot problem.

  1. Turn off your PC completely.
  2. Turn it on and as soon as the Windows logo appears, press and hold the power button to force shutdown. Repeat this 2-3 times until you see Preparing Automatic Repair.
  3. Wait for the Automatic Repair screen, then select Advanced options.
  4. Navigate to Troubleshoot > Advanced options > Startup Settings and click Restart.
  5. After restart, press 4 or F4 to start in Safe Mode.

Once in Safe Mode, you can proceed to uninstall or repair Malwarebytes if it’s causing the issue.

Step 2: Uninstall or Repair Malwarebytes

The file MBAMSwissArmy.sys is a driver used by Malwarebytes. Sometimes, corrupted installations cause boot errors.

  1. In Safe Mode, press Windows + R, type appwiz.cpl, and press Enter to open Programs and Features.
  2. Find Malwarebytes in the list, select it, and click Uninstall.
  3. Follow the on-screen prompts to complete the uninstallation.
  4. Restart your computer normally to see if the error persists.

If you prefer to keep Malwarebytes, download the latest installer from the official website and run it to repair the installation after uninstalling.

Step 3: Use System File Checker (SFC) and DISM Tools

Corrupted system files can also cause boot errors. Windows includes tools to scan and fix these files.

  1. Open Command Prompt as administrator:
    • Press Windows + S, type cmd, right-click Command Prompt, and select Run as administrator.
  2. Type the following command and press Enter:
sfc /scannow

This will scan all protected system files and replace corrupted ones. Wait until it finishes completely.

  1. Next, run the DISM tool to repair the Windows image by typing:
DISM /Online /Cleanup-Image /RestoreHealth

Allow this process to complete, then restart your PC to check if the error is resolved.

Step 4: Update or Disable the MBAMSwissArmy.sys Driver

If the error persists, the driver itself might be outdated or conflicting with other system components.

  1. Press Windows + X and select Device Manager.
  2. Click View and choose Show hidden devices.
  3. Look under Non-Plug and Play Drivers or System devices for MBAMSwissArmy.sys or related entries.
  4. Right-click the driver and choose Update driver, then select Search automatically.
  5. If updating is not available or doesn’t fix the issue, right-click and choose Disable device.

Disabling the driver will stop it from loading, which may fix the boot error, but keep in mind it might reduce Malwarebytes’ functionality temporarily.

Step 5: Perform a System Restore

If the error started recently, restoring Windows to a previous point can undo problematic changes.

  1. Access the Windows Recovery Environment as described in Step 1.
  2. Go to Troubleshoot > Advanced options > System Restore.
  3. Choose a restore point dated before the error began and follow the prompts.
  4. After restoration, reboot your PC normally.

This method helps if the issue was caused by a recent update or software installation.

Frequently Asked Questions (FAQs)

What is MBAMSwissArmy.sys?

It is a driver file used by Malwarebytes Anti-Malware software to help with malware detection and removal at system level.

Can I delete MBAMSwissArmy.sys manually?

Manually deleting system drivers is not recommended as it can lead to system instability. Instead, uninstall or repair Malwarebytes through official tools.

Why does MBAMSwissArmy.sys cause boot errors?

Boot errors can occur if the driver is corrupted, outdated, or conflicts with Windows updates or other software.

Is Safe Mode always required to fix this error?

Safe Mode helps by loading minimal drivers and services, making it easier to troubleshoot and fix problems like this.

Will uninstalling Malwarebytes remove all my malware protection?

Yes, uninstalling Malwarebytes will remove its protection. Consider reinstalling it after fixing the error or use another antivirus temporarily.

How do I prevent this error in the future?

Keep Malwarebytes and Windows updated, avoid forced shutdowns during updates, and regularly scan for malware to prevent driver corruption.

When Nothing Works

If none of the above solutions fix the MBAMSwissArmy.sys boot error, consider the following options:

  • Contact Malwarebytes Support: Visit the official Malwarebytes Support for specialized help.
  • Use Windows 11 Reset: Go to Settings > System > Recovery > Reset this PC to reinstall Windows without losing your files.
  • Seek Professional Help: If you are uncomfortable performing these steps, a certified technician can assist you.

Conclusion

The MBAMSwissArmy.sys boot error on Windows 11 is often related to Malwarebytes driver issues. By starting with Safe Mode and uninstalling or repairing Malwarebytes, many users successfully resolve this problem. Running system scans like SFC and DISM helps fix corrupted files that may contribute to the error.

Updating or disabling the problematic driver, and using System Restore if needed, are effective next steps. Always keep your software updated and maintain regular backups to avoid future issues. If all else fails, official support and Windows reset options are available to get your PC back to normal.

Following these carefully explained steps will help you fix the error and improve your system’s stability.

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