mslo64.sys Driver Error | Steps to Fix

October 28, 2025 Freddy Error Fix 0

The mslo64.sys error typically relates to an issue with a driver file on your Windows system. This file, mslo64.sys, is part of a software package that may be associated with a malware, driver conflict, or a corrupt file on your PC.

Common Causes of mslo64.sys Driver Error:

  1. Malware or Virus Infection: Sometimes malware or a virus disguises itself as system files like mslo64.sys to avoid detection.

  2. Corrupted System Files: The mslo64.sys driver might have become corrupted due to system crashes, improper shutdowns, or disk errors.

  3. Outdated or Faulty Drivers: If you’ve recently installed or updated hardware drivers, an incompatibility might be causing the error.

  4. Third-Party Software Conflict: Some software, particularly from unknown or unreliable sources, may install faulty drivers that cause conflicts with legitimate system files.

Steps to Fix mslo64.sys Driver Error:

1. Run a Full System Scan for Malware or Viruses

Since mslo64.sys could be a virus, the first step is to run a complete system scan using your antivirus software.

  • Windows Defender: You can use Windows Defender to run a quick or full scan:

    • Open Windows Security from the Start menu > Virus & Threat Protection > Quick Scan or Full Scan.

  • Third-Party Antivirus: If you use a third-party antivirus tool (like Malwarebytes, Norton, or Bitdefender), run a full system scan to identify and remove any potential threats.

2. Check for System File Corruption (SFC and DISM)

If mslo64.sys is corrupted or missing, System File Checker (SFC) can help repair it. Here’s how you can do it:

  • Run SFC Scan:

    1. Press Win + X and select Command Prompt (Admin) or Windows PowerShell (Admin).

    2. In the Command Prompt, type:

      sfc /scannow

    3. Press Enter and wait for the process to complete. It will fix any corrupted system files it detects.

  • Run DISM (Deployment Imaging Service and Management Tool):
    If the SFC scan doesn’t resolve the issue, you can run DISM to fix issues with Windows images and files:

    1. Open Command Prompt (Admin) again.

    2. Type the following command:

      DISM /Online /Cleanup-Image /RestoreHealth

    3. Press Enter and let the process complete. This might take several minutes to complete.

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3. Update or Reinstall Drivers

If the issue is related to an outdated or faulty driver, updating or reinstalling the driver could help.

  • Update Drivers:

    1. Right-click the Start menu and select Device Manager.

    2. Look for any devices with an exclamation mark (!), which indicates a driver issue.

    3. Right-click on the device and choose Update Driver. You can choose to search automatically for updates, or you can manually install the latest driver from the manufacturer’s website.

  • Reinstall Drivers:

    1. In Device Manager, right-click the faulty device and select Uninstall device.

    2. After uninstalling, restart your computer. Windows should automatically reinstall the necessary drivers upon reboot.

4. Perform a System Restore

If the problem started recently and you suspect that an update or a change to your system caused it, you can try performing a System Restore.

  • How to Perform System Restore:

    1. Open the Control Panel and go to Recovery > Open System Restore.

    2. Choose a restore point before the error occurred.

    3. Follow the prompts to complete the system restore.

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5. Update Windows

Ensure that your Windows operating system is up-to-date. Sometimes a Windows update might contain fixes for known issues that could resolve the mslo64.sys error.

  • How to Check for Windows Updates:

    1. Open Settings > Update & Security > Windows Update.

    2. Click Check for Updates and install any available updates.

6. Check for Software Conflicts

If you recently installed third-party software that you suspect might be causing the issue, try uninstalling it and see if the error goes away.

  • Uninstall Recent Software:

    1. Open Control Panel > Programs > Programs and Features.

    2. Sort the list by Install Date to identify the software you installed just before the issue occurred.

    3. Uninstall the suspected software and restart your computer.

7. Boot in Safe Mode

If the error prevents you from using Windows properly, you can try booting into Safe Mode to troubleshoot.

  • Boot into Safe Mode:

    1. Press Shift + Restart from the Start menu or the Sign-in screen.

    2. Select Troubleshoot > Advanced Options > Startup Settings > Restart.

    3. When your PC restarts, select Safe Mode (option 4 or 5).

In Safe Mode, Windows will only load essential drivers, allowing you to troubleshoot or uninstall software that might be causing the error.

Summary of Steps to Fix mslo64.sys Error:

  1. Run a full system scan with antivirus software.

  2. Use SFC and DISM to repair corrupted system files.

  3. Update or reinstall any device drivers that might be causing the issue.

  4. Perform a System Restore to revert to a previous working state.

  5. Ensure Windows is up-to-date with the latest patches.

  6. Check for any software conflicts by uninstalling recent programs.

  7. Boot into Safe Mode if needed to troubleshoot.

If none of these solutions work, the mslo64.sys file might need to be manually replaced or restored, but be cautious if the file is potentially malware masquerading as a system file. In such cases, further assistance from a professional technician or support forums might be necessary.

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