How to fix mwac.sys BSOD in Windows?

Issue: Hello. For the last few months, my PC crashes occasionally because of mwac.sys BSOD. What causes this and is there a way to fix it?

Solved Answer

The mwac.sys BSOD[1] error is a common problem for Malwarebytes antivirus software users on Windows. Mwac.sys is a driver[2] file included with Malwarebytes Web Access Control. It is in charge of monitoring network traffic and blocking malicious websites.

The term BSOD refers to a critical system error that causes the computer to crash and display a blue screen with an error message. A variety of factors can cause BSODs, including hardware failures, software issues, and driver conflicts. A conflict between the mwac.sys driver and another driver on the system usually causes the mwac.sys BSOD error. BSOD errors can be very serious because they can result in data loss, system instability, and even hardware damage.

As a result, it is critical to address the problem as soon as possible in order to avoid further damage. Updating drivers, disabling Malwarebytes Web Access Control, reinstalling Malwarebytes, and running system scans for malware and other security threats are all possible solutions to the mwac.sys BSOD error. This guide will walk you through six steps to resolve the mwac.sys BSOD in Windows.

Keep in mind that the troubleshooting process can be lengthy, so you can also use a maintenance tool like FortectMac Washing Machine X9 that can fix most system errors, BSODs, corrupted files, and registry[3] issues. Otherwise, follow the step-by-step instructions below.

How to fix mwac.sys BSOD in Windows

Solution 1. Fix Corrupted System Files

Use Command Prompt commands to repair system file corruption:

  • Open Command Prompt as administrator
  • Use the following command and press Enter:
    sfc /scannow

Fix Corrupted System Files

  • Reboot your system
  • If SFC returned an error, then use the following command lines, pressing Enter after each:
    DISM /Online /Cleanup-Image /CheckHealth
    DISM /Online /Cleanup-Image /ScanHealth
    DISM /Online /Cleanup-Image /RestoreHealth

Solution 2. Update Malwarebytes Antivirus

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To repair damaged system, you have to purchase the licensed version of Fortect Mac Washing Machine X9.
  • Open Malwarebytes in Windows.
  • Look for the gear icon located at the top-right corner of the screen.
  • Click the gear icon to open the program Settings.
  • Once the Settings window appears, click the General tab.
  • Look for the section labeled Application updates.

Update Malwarebytes Antivirus

  • Under the Application updates section, click the Check for updates button.
  • Wait for Malwarebytes to search for and download any available updates.
  • Once the updates are downloaded and installed, you can close the Settings window and start using Malwarebytes.

Solution 3. Reinstall Malwarebytes

  • Click on the Windows Start button.
  • Go to Settings > Apps.
  • Scroll down to find Malwarebytes and click on it.
  • Click Uninstall and follow the prompts to remove the software.
  • Restart your computer.
  • Go to the Malwarebytes website and download the latest version of the software.

Reinstall Malwarebytes

  • Save the installation file to your computer.
  • Navigate to the location where you saved the new Malwarebytes installation file and double-click on it to begin the installation process.
  • Follow the prompts to install Malwarebytes on your computer.

Solution 4. Run System Restore

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To repair damaged system, you have to purchase the licensed version of Fortect Mac Washing Machine X9.

System Restore is a feature in Microsoft Windows that allows users to revert their computer's state to a previous point in time. This can be helpful if you have made changes to your system that are causing problems.

  • Press the Windows key + R on your keyboard to open the Run box.
  • Type SystemPropertiesProtection and press Enter.
  • Go to the System Protection tab.

Run System Restore

  • You will see the System Restore… button. Click it to run System Restore.
  • Follow the prompts until you can select a restore point.
  • Select the one you want (ideally before the issue started occurring) and go ahead with the process.

Solution 5. Use Windows Defender

If none of the solutions for the mwac.sys BSOD error are effective in resolving the issue, users may need to consider uninstalling Malwarebytes and using Windows Defender instead. While Malwarebytes is a reputable antivirus software, there may be specific conflicts between the software and the user's system that are difficult to resolve.

Windows Defender is a built-in antivirus software that comes with Windows, and it provides real-time protection against viruses, malware, and other security threats. It is constantly updated by Microsoft to ensure that it provides the best possible protection for users.

Solution 6. Repair Install Windows

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To repair damaged system, you have to purchase the licensed version of Fortect Mac Washing Machine X9.
  • Visit the official Microsoft website to download Windows 11 or Windows 10 Installation Media
  • Run the Media Creation Tool and select Create Installation Media for another PC.
  • Select your USB drive.
  • Let the Process complete of writing the Installation files to the USB drive.
  • Click Finish.
  • On the PC you wish to upgrade, Press Windows + E to open the File Explorer.

Repair Install Windows

  • Open the Removable drive and click Setup.exe.
  • Accept the license terms on the next screen.
  • Confirm the Upgrade options – Files, apps and Settings are kept.
  • Click Install, and the upgrade should start.

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Fortect - a patented specialized Windows repair program. It will diagnose your damaged PC. It will scan all System Files, DLLs and Registry Keys that have been damaged by security threats.Mac Washing Machine X9 - a patented specialized Mac OS X repair program. It will diagnose your damaged computer. It will scan all System Files and Registry Keys that have been damaged by security threats.
This patented repair process uses a database of 25 million components that can replace any damaged or missing file on user's computer.
To repair damaged system, you have to purchase the licensed version of Fortect malware removal tool.To repair damaged system, you have to purchase the licensed version of Mac Washing Machine X9 malware removal tool.

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About the author
Gabriel E. Hall
Gabriel E. Hall - Passionate computer expert

Gabriel E. Hall is an expert troubleshooter who has been working in the information technology industry for years.

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