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0x00000066BSODCritical

0x00000066 — Cache Initialization Failed | Blue Screen Fix Guide

CACHE_INITIALIZATION_FAILED

Windows XPWindows VistaWindows 7Windows 8Windows 10Windows 11

What Does 0x00000066 Mean?

Cache manager initialization failed during system startup.

Real-World Causes

  1. 1Corrupted system files
  2. 2Disk I/O error during boot
  3. 3Memory failure

Symptoms

  • ⚠Blue screen with stop code CACHE_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 CACHE_INITIALIZATION_FAILED?
Cache manager initialization failed during system startup.
Can I fix Cache 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

0x00000034Cache Manager0x00000031Phase0 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.