Self HelpBoise Computer Care

Blue screen & error codes

IRQL_NOT_LESS_OR_EQUAL and DRIVER_IRQL errors

IRQL_NOT_LESS_OR_EQUAL or DRIVER_IRQL stop code? Find the failing .sys driver, roll back or update it, and fix it from Safe Mode.

Difficulty
Medium
Time
20-60 min
Steps
6
Updated

Sounds like this?

  • Crash screen shows IRQL_NOT_LESS_OR_EQUAL or DRIVER_IRQL_NOT_LESS_OR_EQUAL
  • A .sys file is named under 'What failed'
  • Crashes after a new driver or device

Step by step

  1. Note the .sys file name if shown. Common ones: nvlddmkm.sys (NVIDIA graphics), atikmdag.sys (AMD graphics), Netwtw*.sys or rt*.sys (network), and antivirus drivers.
  2. Unplug new hardware and uninstall recently added software, especially VPNs, antivirus and hardware utilities.
  3. Update or roll back the driver for that device in Device Manager (Properties › Driver).
  4. For graphics, do a clean install of the latest driver from the GPU maker.
  5. Install all Windows updates.
  6. If you can't reach the desktop, use Safe Mode (Windows Recovery › Startup Settings › 4) to remove the driver.

Related error codes & messages

Quick answers

When should I stop and get professional help with "IRQL_NOT_LESS_OR_EQUAL and DRIVER_IRQL errors"?

Stop and get help if: It crashes even in Safe Mode. Different .sys files are blamed each time (often a RAM or hardware problem). Crashes started after a physical knock or liquid spill. Boise Computer Care can diagnose it for a $60 fee; call 208-996-3508.

How long does this fix take and how hard is it?

Plan on 20-60 min. Difficulty: Medium.

Is it safe to try this myself?

Mostly, if you follow these precautions: Download drivers only from Microsoft, your PC maker, or the hardware maker (Intel, AMD, NVIDIA, Realtek).

Which error messages or codes does this guide cover?

IRQL_NOT_LESS_OR_EQUAL, DRIVER_IRQL_NOT_LESS_OR_EQUAL, 0x0000000A, 0x000000D1, nvlddmkm.sys, Netwtw10.sys.

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