How to Troubleshoot: DRIVER_IRQL_NOT LESS OR EQUAL (kbdclass.sys) on Windows 10

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Blue screen Driver IRQL error NOT LESS OR EQUAL after a recent Windows 10 update or installation of a new hardware device? An IRQL error is a memory-related error that often occurs when a system process or driver attempts to access a memory address for which it does not have the correct permissions. The problem is mostly caused by an incompatible driver, third-party antivirus software, or hardware failure.

In this post, we have listed all possible causes and solutions to fix the Driver_irql_not_less_or_equal bluescreen error in Windows 10.

What causes DRIVER_IRQL_NOT LESS OR EQUAL (kbdclass.sys)?

The “DRIVER_IRQL_NOT_LESS_OR_EQUAL” error can occur if your network driver uses the wrong memory address. You may also see “ndis. sys” on the screen. “ndis.sys” is the system file for network drivers. You can update the network driver to fix this error.

How to fix DRIVER_IRQL_NOT LESS OR EQUAL (kbdclass.sys)?

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Reinstall the USB controllers

  1. Press WINDOWS + X and select Device Manager from the pop-up menu.
  2. Now find the Universal Serial BUS Controllers option in the Device Manager window and double-click it.
  3. Right-click on the Generic USB Hub option and select Uninstall Device from the submenu.
  4. Follow the same process for all USB root hubs in the same list.
  5. Then restart your system. Your operating system will automatically reinstall the controllers on your computer.

Updating the driver

  1. First, press the WINDOWS + X key combination and select “Device Manager” from the pop-up menu.
  2. Now find the Keyboard option in the Device Manager window and expand it.
  3. In the list of keyboard drivers, right-click on the name of the device listed and select Update Driver from the submenu.
  4. On the next screen, select the first option “Automatically check for driver software updates”.
  5. Your system will now detect, download and install the latest driver version (if available).
  6. Follow the on-screen instructions to complete the process.

Resetting the keyboard driver

  1. First, press the WINDOWS + X key combination and select “Device Manager” from the pop-up menu.
  2. Now, in the “Device Manager” window, find the “Human Interface Devices” option and double-click it to expand it.
  3. Find the HID keyboard driver here, right-click on it and select “Properties” from the submenu.
  4. In the Properties window, select the Driver tab in the vertical menu.
  5. In the same menu, click the Reset Driver tab, and then click OK.
  6. Then reconnect the wireless keyboard and see if it works correctly or if the error persists.



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Frequently Asked Questions

In most cases, however, this error is related to the RAM (Random Access Memory) of your computer. It happens when a program, application, or driver accesses RAM without permission.

One of the most common Windows shutdown codes is called IRQL_NOT_LESS_OR_EQUAL. Actually, IRQL_NOT_LESS_OR_EQUAL (sometimes simply called "IRQL") is a typical memory-related error that occurs when a system process or device driver attempts to access a memory address for which it does not have valid access rights.

The "DRIVER_IRQL_NOT_LESS_OR_EQUAL" error occurs when your network driver uses the wrong memory address. You may also see "ndis.sys" on the screen. You can update your network driver to fix this error.

  1. Start Windows.
  2. Press the Windows key and the C key to open the Charms panel.
  3. Click on Settings.
  4. Go to Change PC Settings.
  5. Select General.
  6. Click Advanced Startup.
  7. Click Restart now.
  8. Go to Troubleshooting.
  9. Select Advanced Settings.
  10. Click on UEFI Firmware Settings.
  11. Select Restart.

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