Also, you can check how to fix USB device not recognized in Windows 11.

What causes DRIVER_IRQL_NOT_LESS_OR_EQUAL kbdclass.sys?

The following are some of the factors that may be responsible for the DRIVER_IRQL_NOT_LESS_OR_EQUAL kbdclass.sys error:

Corrupt system files – Windows systems files are responsible for hosting the activities of devices and components on the PC. If the system files are corrupted, they can affect device drivers, resulting in the BSoD error. Conflict with Antivirus programs – Antivirus software running on your PC may interfere with the activities of the keyboard connected. A common one is Webroot antivirus, and recent updates on the software can be faulty, causing the error. Conflicting drivers – Installing an incompatible or invalidated driver with the operating system running on your PC can cause the error. Issues with the USB Controllers – The Universal Serial BUS Controllers ensure the devices connected to the computer function properly and interact with the necessary system components. So, if they are not intact or working correctly, it may result in the kbdclass.sys crash.

Though these factors vary on different computers, you can fix them by following the steps below.

How can I fix the BSoD DRIVER IRQL NOT LESS OR EQUAL kbdclass.sys error?

Before proceeding with any advanced troubleshooting steps, go through the following:

Turn off background apps running on your computer. Temporarily disable Antivirus software. Restart Windows in Safe Mode and check if the notification appears.

If you can’t resolve the error, try the steps below:

1. Reset the Driver’s changes

Rolling back driver changes will reset it to the version where it works correctly, removing faulty settings or updates.

2. Run an SFC scan

An SFC scan will find and repair corrupt system files causing the kbdclass.sys error. You can check how to fix the run as administrator option if it’s not working on your PC. SPONSORED Otherwise, you can opt for another effective method to repair OS files, so we advise you to try an automatic assistant like Fortect. The tool will check your Windows system for corrupted files and replace them with clean versions from its extensive repository.

3. Uninstall USB Controllers

Uninstalling the USB Controllers will allow your system to run and use new ones.

4. Update driver using Windows update

Updating drivers will improve the device’s performance and fix the kbdclass.sys. You can read about ways to diagnose and fix Windows Update not loading on your computer.

5. Run System Restore

Running System Restore will backdate the system and undo some recent system modifications on the PC. Read our guide on how to fix Restore Point if it’s not working on your PC. Alternatively, you can learn about fixing the Keyboard if it’s not working after Windows 10/11 rollback on your PC. If you have further questions or suggestions on this guide, kindly drop them in the comments section.

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