The IRQL_NOT_LESS_OR_EQUAL error in Windows 11 appears when a kernel-mode driver or process attempts to access a memory address it does not have permission to access. When this happens, Windows 11 triggers a blue screen of death (BSOD) to prevent further damage and automatically restarts your PC. Most of the time, these issues are caused by faulty drivers (particularly network, graphics, or chipset drivers), corrupted system files, incompatible software, or hardware failures such as defective RAM. If your Windows 11 PC keeps crashing with the IRQL_NOT_LESS_OR_EQUAL error, follow the instructions below to fix it.
Post Contents :-
- 1 What causes the IRQL_NOT_LESS_OR_EQUAL error?
- 2 Quick Steps to Fix IRQL_NOT_LESS_OR_EQUAL in Windows 11
- 2.1 Disconnect External Devices and Reboot Your PC
- 2.2 Start Windows 11 in safe mode
- 2.3 Remove Third‑Party Antivirus and Problematic Software
- 2.4 Update or Reinstall Display and Other Device Drivers
- 2.5 Install the Latest Windows 11 Updates
- 2.6 Repair System Files Using SFC and DISM
- 2.7 Run Windows Memory Diagnostic Tool (Check RAM)
- 2.8 Check Hardware and Overheating Issues
- 3 Frequently Asked Questions
What causes the IRQL_NOT_LESS_OR_EQUAL error?
This issue is primarily caused by incompatible, outdated, or faulty device drivers that attempt to access memory addresses at an interrupt request level (IRQL) higher than they are permitted.
Other common triggers include:
- RAM or other hardware issues – Defective memory modules, failing hard drives/SSDs, or loose connections.
- Corrupted system files – Caused by sudden power outages, forced shutdowns, or malware infections.
- Conflicting software or services – Third‑party antivirus, system utilities, or recently installed apps can conflict with existing drivers.
- Overheating or dust buildup – High CPU or GPU temperatures and poor airflow can cause instability.
Quick Steps to Fix IRQL_NOT_LESS_OR_EQUAL in Windows 11
If you want a fast overview before the detailed guide, try these steps in order:
- Disconnect unnecessary USB devices and restart your PC.
- Boot Windows 11 into Safe Mode.
- Uninstall any recently installed apps or third‑party antivirus.
- Update or reinstall display, network, and chipset drivers.
- Install the latest Windows 11 updates.
- Run SFC and DISM to repair corrupted system files.
- Use Windows Memory Diagnostic to test your RAM.
- Check your hardware (RAM seating, dust buildup, overheating, drives) if the error persists.
Now let’s go through each method in detail.
Disconnect External Devices and Reboot Your PC
Sometimes, external devices like USB drives, printers, and external hard drives can cause driver conflicts that trigger the IRQL_NOT_LESS_OR_EQUAL or DRIVER_IRQL_NOT_LESS_OR_EQUAL errors.
- Turn off your computer completely.
- Disconnect all external devices such as USB drives, printers, external hard drives, game controllers, and other peripherals.
- Leave only the keyboard, mouse, and monitor connected.
- Turn on your PC and use it for a while to see if the blue screen returns.
If the error disappears, reconnect devices one by one to identify which one is causing the problem.
Start Windows 11 in safe mode
Safe Mode starts Windows 11 with only essential drivers and services. This can help you troubleshoot if a third-party driver or piece of software is causing the error. If your computer is restarting frequently, safe mode can help stabilize it so you can perform further troubleshooting steps.
To start Windows 11 in Safe Mode:
- Press the Windows key on your keyboard, and click on the power icon
- While holding down the Shift key on your keyboard, click on “Restart.”
- You will see the “Choose an option” screen. Select “Troubleshoot.”
- On the next screen, select “Advanced options” then click on “Startup Settings.”
- Click on the “Restart” button to proceed.
- And finally, press F4 to start Windows 11 in safe mode, or F5 to enable internet access in safe mode.
Remove Third‑Party Antivirus and Problematic Software
Third‑party antivirus suites and some system utilities can conflict with Windows 11 drivers, leading to DRIVER_IRQL_NOT_LESS_OR_EQUAL or IRQL_NOT_LESS_OR_EQUAL errors.
If the problem started after installing an antivirus program or another app, try removing it.
- Right‑click the Start button and select Installed apps (or Apps & features).
- Scroll through the list and find your third‑party antivirus or any recently installed software.
- Click the three‑dot menu next to it and select Uninstall.
- Follow the on‑screen instructions to complete the removal.
- Restart your computer and check if the blue screen error still appears.
You can temporarily rely on Windows Security (Windows Defender) while you test if the issue is resolved.
Update or Reinstall Display and Other Device Drivers
Outdated or corrupted drivers are one of the most common causes of driver irql not less or equal Windows 11 errors. It’s important to update critical drivers like graphics, network, and chipset drivers to resolve compatibility issues and prevent the error from occurring.
Update Drivers via Device Manager
- Press the Windows key + X and select Device Manager,
- Expand categories such as Display adapters, Network adapters, and System devices (for chipset drivers).
- Right‑click a device (for example, your graphics card) and select Update driver.
- Click Search automatically for drivers to let Windows search for newer drivers.
This will check Windows updates for the latest available driver updates and install them.
- Repeat this for other key devices: graphics, network, and chipset.
If Windows doesn’t find new drivers, you may need to download them manually from the manufacturer’s website.
Clean Reinstall the Display Driver
If updating doesn’t help, a clean reinstall of the display driver can fix corruption or conflicts that trigger the DRIVER_IRQL_NOT_LESS_OR_EQUAL error.
- Press Windows + X and select Device Manager.
- Expand Display adapters. Right‑click your display adapter (e.g., NVIDIA, AMD, Intel) and select Uninstall device.
- If available, check Delete the driver software for this device, then click Uninstall.
- Restart your computer. Windows will attempt to install a default display driver automatically.
If Windows does not install the correct driver:
- Visit the official website for your GPU: NVIDIA, AMD, or Intel.
- Download the latest Windows 11 driver for your specific graphics card model.
- Run the driver installer and follow the on‑screen instructions.
- Restart your PC and check if the IRQL_NOT_LESS_OR_EQUAL blue screen is gone.
Install the Latest Windows 11 Updates
Microsoft regularly publishes cumulative updates with numerous bug fixes and security enhancements. A known issue causing the IRQL_NOT_LESS_OR_EQUAL error may already be fixed in a newer Windows 11 update.
- Press Windows + X and select Settings.
- Go to Windows Update from the left pane. Click Check for updates.
- If new updates are available, click Download & install.
- Once done, restart your computer to apply the changes.
Check if your computer now boots normally without any BSOD (blue screen of death) errors.
Repair System Files Using SFC and DISM
Corrupted or missing system files can also lead to the IRQL_NOT_LESS_OR_EQUAL or DRIVER_IRQL_NOT_LESS_OR_EQUAL stop codes. Windows includes built‑in tools like System File Checker (SFC) and DISM to repair them.
- Press Windows + S, type cmd. Right‑click Command Prompt and select Run as administrator.
- Type the command sfc /scannow and press the enter key,
- This will scan your computer for corrupted and missing system files.
- Wait for the scan to complete. This may take some time.
- When the scan is finished, SFC will display whether it found and repaired corrupted files.
If SFC reports that it couldn’t fix some files or the process fails, run the DISM restorehealth command.
- On the same command prompt window, type the command DISM /Online /Cleanup-Image /RestoreHealth and hit the enter key.
- Wait for DISM to complete the process. This can take several minutes, especially if it downloads files from Windows Update.
- Once the command finishes, restart your computer.
After rebooting, check if the driver irql not less or equal error still appears.
Run Windows Memory Diagnostic Tool (Check RAM)
Faulty or unstable RAM is another common cause of the IRQL_NOT_LESS_OR_EQUAL error on Windows 11. You can use the built‑in Windows Memory Diagnostic tool to test your memory.
To run Windows Memory Diagnostic:
- Press Windows key + R, type mdsched.exe and press ok,
- Click Restart now and check for problems (recommended),
- Your computer will restart and perform a memory check. Allow the process to complete.
- Wait for the test to finish. This might take a while, depending on the size of your memory.
- After Windows boots back into the desktop, it will show a notification with the results (or you can check the Event Viewer for details).
If memory errors are detected:
- Power off your computer and unplug it from the power source.
- Open your PC case or laptop’s back panel (if possible).
- Carefully remove the RAM modules, clean out any dust, and reseat the RAM firmly.
- If you have multiple RAM sticks, test them one at a time to identify the faulty module.
- Replace the defective RAM if needed.
Also, check your CPU temperature and system cooling. Overheating can cause instability and blue screens. Clean dust from fans and heat sinks, and ensure proper airflow inside the case.
Check Hardware and Overheating Issues
If you still see the IRQL_NOT_LESS_OR_EQUAL or DRIVER_IRQL_NOT_LESS_OR_EQUAL error after trying the software fixes, your hardware may be at fault.
Things to check:
- Hard drive / SSD health – Use tools like CrystalDiskInfo or the manufacturer’s utility to check for bad sectors or drive health issues.
- Cables and connections – Ensure SATA/SSD and power cables are firmly connected.
- Dust and airflow – Clean dust from fans, vents, and components to improve cooling.
- Overclocking – Disable CPU/GPU/RAM overclocking in BIOS/UEFI and revert to default settings.
- Temperature monitoring – Use hardware monitoring tools to check CPU and GPU temperatures under load.
If hardware issues are suspected and you’re not comfortable opening your PC, consider getting help from a professional technician.
If you’re still seeing the IRQL_NOT_LESS_OR_EQUAL error after trying all these methods, you may be facing a deeper hardware problem. In that case, back up your important data and contact a professional technician for a detailed diagnosis.
Frequently Asked Questions
The IRQL_NOT_LESS_OR_EQUAL error in Windows 11 usually occurs when a driver or kernel‑mode process accesses invalid memory at an incorrect interrupt request level. This is commonly caused by faulty drivers, RAM problems, corrupted system files, or conflicting third‑party software.
No. While faulty RAM can trigger the IRQL_NOT_LESS_OR_EQUAL blue screen, it’s not the only cause. Outdated or corrupted drivers, damaged system files, and even malware can also lead to this stop code. That’s why you should test RAM and update drivers and repair system files.
DRIVER_IRQL_NOT_LESS_OR_EQUAL is a related stop code that specifically points to a driver issue. It means a driver tried to access memory at an invalid IRQL. Updating, reinstalling, or rolling back problematic drivers (especially display, network, and storage drivers) usually helps fix this error in Windows 11.
In most cases, yes. You can usually fix IRQL_NOT_LESS_OR_EQUAL on Windows 11 by disconnecting external devices, uninstalling conflicting apps, updating or reinstalling drivers, installing Windows updates, running SFC/DISM, and checking RAM. Reinstalling Windows 11 is only recommended as a last resort when all other methods fail.
Author’s note: The steps in this guide are based on practical troubleshooting experience with Windows 11 systems. Always back up your data before making major system changes or working with hardware.
