Windows errors

Blue screen: DRIVER_IRQL_NOT_LESS_OR_EQUAL stop code

Similar to the general IRQL error but specifically flagged as driver-related, this blue screen means a device driver accessed memory incorrectly, and Windows almost always names the exact driver file responsible.

Difficulty
Intermediate
Time
1–2 hours
DIY cost
$0
Pro cost
$80–$150

Symptoms

  • Blue screen specifically names DRIVER_IRQL_NOT_LESS_OR_EQUAL
  • Crash details typically name a specific .sys driver file
  • Often follows installing new hardware, a driver, or a peripheral
  • PC restarts after the crash

Likely causes

  • CommonA specific outdated or buggy driverThis stop code is designed to point directly at the offending driver file.
  • CommonNewly installed hardware or peripheralA new printer, webcam, or other device's driver is a frequent cause right after installation.
  • PossibleDriver conflict between two pieces of softwareTwo drivers competing for the same resource can trigger this.
  • PossibleCorrupted driver installationA partially or improperly installed driver can behave unpredictably.
  • Less commonFaulty RAMOccasionally memory issues present through this driver-focused error.

What to do

  1. Note the exact driver file name shown in the crash details; searching for it directly often reveals which hardware and manufacturer it belongs to.
  2. Uninstall the device associated with that driver from Device Manager, then reinstall the latest driver from the manufacturer's official website.
  3. If the crash started right after adding new hardware, temporarily disconnect it and see if crashes stop, confirming it as the cause.
  4. Use Device Manager to check for any other drivers showing a warning icon and update those as well.
  5. Run 'sfc /scannow' to rule out corrupted system files interfering with driver loading.
  6. If two specific programs seem to conflict (for example, two different antivirus or VPN tools), uninstall one and test with only the other installed.
  7. Run Windows Memory Diagnostic as a final check if driver updates don't resolve the crashes.

Tools and parts

  • None beyond what's built into Windows

When to call a pro

If the named driver has no update available or removing the associated hardware doesn't stop the crashes, a technician can investigate further using the full crash dump.

Safety

Generally low risk

Generally low risk for a careful person. Stop if anything looks different from what this guide describes.

Related guides

Operator provides AI-generated troubleshooting information. It can be wrong. For safety-critical, electrical, gas, structural, medical, automotive safety, or other high-risk problems, consult a qualified professional.