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0x00000063BSODCritical

0x00000063 — Security1 Initialization Failed | Blue Screen Fix Guide

SECURITY1_INITIALIZATION_FAILED

Windows XPWindows VistaWindows 7Windows 8Windows 10Windows 11

What Does 0x00000063 Mean?

Phase 1 of security subsystem initialization failed.

Real-World Causes

  1. 1Corrupted security database
  2. 2Missing security system files
  3. 3Registry corruption

Symptoms

  • ⚠Blue screen with stop code SECURITY1_INITIALIZATION_FAILED
  • ⚠System reboots unexpectedly
  • ⚠Possible data loss from unsaved work

DIY Fix

Beginner-friendly steps you can try at home

  1. 1Restart your computer
  2. 2Use Windows Recovery Environment
  3. 3Run Startup Repair
  4. 4Rebuild BCD with bootrec commands

Advanced Fix

For experienced users and IT professionals

  1. 1Rebuild BCD store manually
  2. 2Use bcdedit to verify boot configuration
  3. 3Repair Master Boot Record with bootrec /fixmbr
  4. 4Reinstall Windows if boot files are corrupted

Frequently Asked Questions

What causes SECURITY1_INITIALIZATION_FAILED?
Phase 1 of security subsystem initialization failed.
Can I fix Security1 Initialization Failed 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

0x00000029Security System0x0000006CRefmon Initialization Failed

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.