LOADER_BLOCK_MISMATCH

What is 0x00000100?

LOADER_BLOCK_MISMATCH is a critical-severity Windows operating system issue. A Loader Block Mismatch occurs when the boot loader (Winload.efi) passes a system parameters block to the Windows kernel that is incompatible or corrupted. Commonly caused by corrupted boot records, memory faults, or unstable overclocking. It's also often linked to failed storage driver installation. Follow the steps below to fix it.

Common Causes

• Damaged or corrupted EFI bootloader files (winload.efi)
• Unstable memory overclocking (XMP/EXPO) or timing
• Corrupted Windows registry system hive
• Failed storage driver installation

Step-by-Step Fix Guide

• 1
  Rebuild the Boot Configuration Data (BCD) using recovery USB

  We'd suggest Rebuild the Boot Configuration Data first — it's the fix most often responsible for solving 0x00000100 outright.

• 2
  Clear CMOS or disable XMP/EXPO memory profiles

  Where the fault comes back, look to the later steps — they're built around uncommon boot records instability triggers.

• 3
  Run Startup Repair from Windows Recovery

  "Run Startup Repair from Windows Recovery" targets corrupted Windows registry system hive, one of the documented causes of 0x00000100.

• 4
  Run SFC scan offline in Command Prompt

  "Run SFC scan offline in Command Prompt" handles an edge case some users report with 0x00000100.

Commands & Diagnostics

Frequently Asked Questions