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0x00000003BSODCritical

0x00000003 — Invalid Affinity Set | Blue Screen Fix Guide

INVALID_AFFINITY_SET

Windows XPWindows VistaWindows 7Windows 8Windows 10Windows 11

What Does 0x00000003 Mean?

An invalid processor affinity set was specified. The thread affinity mask is invalid for the current system configuration.

Real-World Causes

  1. 1Driver specifying invalid processor affinity
  2. 2System misconfiguration
  3. 3Corrupted kernel structures

Symptoms

  • ⚠Blue screen with stop code INVALID_AFFINITY_SET
  • ⚠System reboots unexpectedly
  • ⚠Possible data loss from unsaved work

DIY Fix

Beginner-friendly steps you can try at home

  1. 1Restart your computer
  2. 2Run System File Checker (sfc /scannow)
  3. 3Check Windows Update
  4. 4Run DISM /Online /Cleanup-Image /RestoreHealth

Advanced Fix

For experienced users and IT professionals

  1. 1Analyze minidump with WinDbg
  2. 2Check Event Viewer for correlated errors
  3. 3Use Process Monitor to trace system activity
  4. 4Perform clean boot to isolate the cause

Frequently Asked Questions

What causes INVALID_AFFINITY_SET?
An invalid processor affinity set was specified. The thread affinity mask is invalid for the current system configuration.
Can I fix Invalid Affinity Set myself?
In many cases yes. Start with basic troubleshooting like restarting, updating drivers, and running System File Checker. If the issue persists, advanced analysis of crash dumps may be needed.

Related Error Codes

0x00000007Invalid Software Interrupt0x0000003EMultiprocessor Configuration not Supported

About the Author

Windows Troubleshooting Team

Verified against official Microsoft documentation and real-world diagnostic data. Error behavior confirmed across Windows 10, Windows 11, and Windows Server.