LOADER_BLOCK_MISMATCH

What is 0x00000100?

The 0x00000100 error is categorized as a critical-severity Windows operating system issue that can significantly impact your PC's stability. 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. When experiencing the LOADER_BLOCK_MISMATCH fault, users report system boot loops, failure to enter Windows, or instant Blue Screens of Death (BSOD) at startup. In most diagnostic scenarios, this problem is directly triggered by damaged EFI bootloader files, unstable RAM timings, and registry hive corruption. To permanently resolve the 0x00000100 issue and prevent further system degradation, it is highly recommended to follow our step-by-step troubleshooting guide below, ensuring your Windows operating system components are functioning correctly.

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

  Applying the first fix (Rebuild the Boot Configuration Data) addresses the most common root cause of 0x00000100 and restores baseline functionality.

• 2
  Clear CMOS or disable XMP/EXPO memory profiles

  If the problem persists, proceeding with the remaining steps ensures all edge cases related to boot records instability are covered.

• 3
  Run Startup Repair from Windows Recovery
• 4
  Run SFC scan offline in Command Prompt

Commands & Diagnostics