Portcls.sys BSOD: How to Fix It (3 Easy & 4 Advanced Fixes)

Fix & Repair Solved issue

Question asked by:

Tomé F.


Bluescreen of Death - related to Portcls.sys

Hi guys, my PC went blue screen and it shows up a Portcls.sys error with a bunch of text. Can you guide me on how to fix this?
Appreciate any help!
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At WindowsGuided, we received a visitor request related to the portcls.sys file error in Windows. The Blue Screen of Death (BSOD)1 is a familiar foe to many Microsoft Windows users, and the Portcls.sys error is a particularly troublesome variant.
In this guide, we aim to demystify the Portcls.sys BSOD, offering insight into its causes and providing effective actionable solutions on how to fix this error.

What is Portcls.sys All About?

This file is a crucial part of your computer’s operating system, mainly dealing with audio stuff.

Sometimes, this file can run into trouble for whatever different reason.
When that happens, your computer’s audio system most likely will malfunction in one way or another. This can lead to bigger problems, like your computer becoming unstable, and might even cause one of the worst errors — Blue Screen of Death (learn how to fix any BSOD here). This usually happens when dealing with programs like VLC Media Player, Youtube, Windows Media Player and such.

Now let’s see the main causes and ways to fix this Blue Screen of Death error.

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How to fix Portcls.sys BSOD

Common Causes of the Portcls.sys BSOD Problem

Several factors can trigger a Portcls.sys BSOD, but the most common are:

  • Audio Driver Incompatibility: Outdated or incompatible audio drivers2 are frequent culprits.
  • Software Conflicts: Certain applications can conflict with system files, causing the BSOD.
  • Driver Corruption: Other corrupt or outdated drivers can also lead to system instability.

How to Diagnose the Portcls.sys BSOD Issue?

Before diving into solutions, it’s vital to diagnose the issue accurately:

  1. Check for specific error messages related to Portcls.sys.
  2. Use Windows’ Event Viewer and other diagnostic tools to pinpoint the problem.

The type of error message you might see when the error occurs:

Bug check code: 0x0000003b 
Bug check parameters: 0x00000000c0000005, 0xfffff8029b93710e, 0xffff9580e4946910, 0x0000000000000000
Device name: Port Class (Class Driver for Port/Miniport Devices) 
Driver version: 10.0.19041.1 (WinBuild.160101.0800) 
Driver path: C:\WINDOWS\System32\drivers\portcls.sys

3 Easy Step-by-Step Ways to Fix Portcls.sys BSOD Problem

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#1: Uninstall affected drivers/software that you saw in the error message

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Uninstall Affected Drivers Software
  • Identify and remove any software or drivers that may be causing conflicts.
  • Utilize the “Control Panel” or “Settings” app to uninstall these programs.

#2: Use “System Utilities” to diagnose any hardware problems

Windows Utilities
  • Use “Device Manager” for hardware-related troubleshooting.
  • Run system checks to identify any underlying issues in your hardware.

#3: Update or reinstall audio drivers

update audio drivers
  • Visit your device manufacturer’s website to download the latest drivers.
  • Or Use “Device Manager” to update or reinstall drivers.

4 Advanced Fixes and Workarounds

If the above steps don’t resolve the issue, consider the following:

#1: Perform a system restore to revert to a state before the BSOD started occurring on your PC

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  • Access ‘System Restore‘ by typing “Create a restore point” in the Windows search bar and selecting the corresponding result.
Create a restore point
  • In the “System Properties” window, click on the “System Restore” button.
System Restore
  • Follow the prompts to choose a restore point. Select a date before the onset of the BSOD issues.
  • Confirm your choice and start the restore process. Your computer will restart and reboot during this process.

#2: Ensure your Windows system is up-to-date

  • Open “Settings” (you can press ‘Windows + I’).
  • Navigate to “Update & Security”.
  • Click on “Windows Update”, and then on “Check for updates”.
Check for Updates
  • Install any available updates. Your computer might need to restart to complete the installation.

#3: Conduct a full system malware scan

Conduct a full system malware scan
  • Use “Windows Security” (formerly Windows Defender) or any reliable third-party antivirus program.
  • Open the antivirus software and select the option for a “full” or “comprehensive” scan. The scan might take a significant amount of time, depending on the amount of data and the speed of your system.
  • Follow the software’s instructions to deal with any detected malware.

How to Prevent the Portcls.sys & Other BSODs in The Future?

Here’s how to make sure the Portcls.sys BSOD doesn’t happen to your computer:

  • Regularly update your system and drivers to the latest versions whether you’re using Windows 10 or Windows 11.
  • Monitor software installations and keep a check on system performance post-installation.
  • Be cautious with third-party applications, especially those interfacing with system drivers.

Last Word from Our Experts

The Portcls.sys BSOD can be daunting, but with the right approach, it’s manageable. By using a total of 7 different solutions we provided above — we hope you were able to fix the issue.

We also advise you to use the software suggested below for an automatic resolution of any BSOD issues you might be encountering with your computer system.

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If your Portcls.sys errors are still not fixed — feel free to reach out to us via email and share your problem.

  1. What is BSOD? — via TechTarget []
  2. PC drivers explained — Youtube []
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About the author
Ross Zilbert - Expert Author

Ross is an avid author on WindowsGuided.com. He’s been working in the field of software and networks as a technician for more than 6 years.

Now he’s sharing his expertise and awesome guides with the broad public.