Windows 11 BSOD: Fix Blue Screen of Death Errors (Memory Management, PFN List Corrupt, Kernel Security Check Failure & More)

Understanding Windows 11 BSOD Errors

A Blue Screen of Death (BSOD) on Windows 11 is a critical kernel-level stop error displayed when Windows encounters a fatal condition it cannot recover from. The screen shows a stop code (e.g., MEMORY_MANAGEMENT, PFN_LIST_CORRUPT, KERNEL_SECURITY_CHECK_FAILURE) and a QR code. Understanding the stop code is the first step to a targeted fix.

Common Windows 11 BSOD Stop Codes and Their Meanings

• MEMORY_MANAGEMENT (0x0000001A): Indicates a severe memory management error. Usually caused by faulty RAM, incompatible RAM speeds (XMP/EXPO profiles), or corrupt page file.
• PFN_LIST_CORRUPT (0x0000004E): Page Frame Number list corruption — almost always a RAM defect or a malfunctioning storage driver corrupting memory structures.
• KERNEL_SECURITY_CHECK_FAILURE (0x00000139): A data structure integrity violation detected by the kernel. Commonly triggered by outdated or incompatible drivers (especially after Windows 11 updates), antivirus software, or hardware issues.
• SYSTEM_SERVICE_EXCEPTION (0x0000003B): A system service threw an unhandled exception; frequently caused by corrupt drivers or conflicting software.
• CRITICAL_PROCESS_DIED (0x000000EF): A critical OS process terminated unexpectedly, often due to corrupt system files or a failing drive.
• IRQL_NOT_LESS_OR_EQUAL (0x0000000A): A driver attempted to access memory at an IRQL too high; almost always a driver bug.

Step 1: Read the BSOD Log in Windows 11

Before applying any fix, identify the exact stop code and the failing module.

Method A — Event Viewer:

1. Press Win + X → select Event Viewer.
2. Navigate to Windows Logs → System.
3. Filter by Event ID 41 (Kernel-Power, unexpected shutdown) or Event ID 1001 (BugCheck).
4. The event details show the stop code and the faulting module.

Method B — WinDbg (most accurate): Open an elevated PowerShell and run:

Get-EventLog -LogName System -Source "Microsoft-Windows-WER-SystemErrorReporting" -Newest 10

Or open the minidump (located at C:\Windows\Minidump\*.dmp) with WinDbg from the Microsoft Store and run !analyze -v for a full analysis.

Method C — BlueScreenView (free utility): Download NirSoft BlueScreenView, point it at C:\Windows\Minidump, and it will parse all crash dumps into a readable table showing the stop code, date, and faulting driver.

Step 2: Boot Into Safe Mode (When BSOD Occurs on Startup)

If Windows 11 won't boot due to BSOD on startup:

1. Force three consecutive hard shutdowns (hold power button) to trigger Automatic Repair.
2. Choose Troubleshoot → Advanced Options → Startup Settings → Restart.
3. Press 4 for Safe Mode or 5 for Safe Mode with Networking.
4. Once in Safe Mode, proceed with the diagnostic steps below.

Step 3: Run System File Checker and DISM

Corrupt system files are a frequent cause of BSODs, especially after Windows 11 updates.

Open an elevated Command Prompt or PowerShell as Administrator and run:

:: Step 1 - Check and repair system files
sfc /scannow

:: Step 2 - Repair the Windows image (if SFC reports unfixable corruption)
DISM /Online /Cleanup-Image /CheckHealth
DISM /Online /Cleanup-Image /ScanHealth
DISM /Online /Cleanup-Image /RestoreHealth

:: Step 3 - Run SFC again after DISM
sfc /scannow

Reboot after completion and check if the BSOD recurs.

Step 4: Update or Roll Back Drivers

KERNEL_SECURITY_CHECK_FAILURE and similar stop codes after a Windows update almost always point to an incompatible driver.

Roll back a driver:

1. Press Win + X → Device Manager.
2. Expand the relevant category (Display adapters, Network adapters, etc.).
3. Right-click the device → Properties → Driver tab → Roll Back Driver.

Update all drivers via PowerShell:

# List devices with driver issues
Get-WmiObject Win32_PnPEntity | Where-Object {$_.ConfigManagerErrorCode -ne 0} | Select-Object Name, ConfigManagerErrorCode

# Update a specific driver using PnPUtil (replace with actual .inf path)
pnputil /add-driver "C:\Drivers\driver.inf" /install

For GPU drivers (NVIDIA/AMD), always download directly from the manufacturer website and perform a clean install to remove old driver remnants.

Step 5: Fix Windows 11 BSOD After Update — Uninstall Problematic KB

If the BSOD started immediately after a Windows Update, identify and remove the update:

# List recent Windows Updates
Get-HotFix | Sort-Object InstalledOn -Descending | Select-Object -First 10

# Uninstall a specific update (replace KBxxxxxxx with actual KB number)
wusa /uninstall /kb:5034765 /quiet /norestart

Alternatively: Settings → Windows Update → Update History → Uninstall Updates, then select the most recently installed KB.

After removal, pause Windows Updates temporarily: Settings → Windows Update → Pause Updates until a fixed update is released.

Step 6: Fix Memory Management and PFN List Corrupt BSODs

These stop codes point directly at RAM.

Run Windows Memory Diagnostic:

:: Launch the built-in tool (requires reboot)
mdsched.exe

Choose "Restart now and check for problems." Windows will run two passes and report results in Event Viewer under Windows Logs → System → MemoryDiagnostics-Results (Event ID 1201).

Run MemTest86 for thorough testing: Download MemTest86 (free), write to a USB drive, boot from it, and run at least 2 full passes (each pass ~30-60 min per 8 GB of RAM). Any errors = faulty RAM that must be replaced.

Additional RAM fixes:

• If you have XMP/EXPO profiles enabled in BIOS, try disabling them and running RAM at stock JEDEC speeds.
• Try reseating RAM modules. If you have multiple sticks, test each one individually to isolate the faulty module.
• Check for RAM compatibility with your specific Windows 11 motherboard model.

Step 7: Check Storage Health

A failing SSD or HDD can corrupt memory structures and cause PFN_LIST_CORRUPT or CRITICAL_PROCESS_DIED.

# Check drive health via CrystalDiskInfo or Windows built-in
# Run CHKDSK on C: drive (schedules on next reboot)
chkdsk C: /f /r /x

# Check SMART status via PowerShell
Get-PhysicalDisk | Select-Object FriendlyName, OperationalStatus, HealthStatus, Size

If HealthStatus returns Warning or Unhealthy, replace the drive immediately.

Step 8: Perform a System Restore or In-Place Upgrade

System Restore (if a restore point exists):

1. Press Win + R → type rstrui.exe → Enter.
2. Select a restore point dated before the BSODs began.
3. Click Finish and allow the system to restore.

In-place upgrade repair install (last resort): Download the Windows 11 ISO from Microsoft, mount it, and run setup.exe. Choose Keep personal files and apps. This reinstalls Windows without data loss and fixes deep system corruption.

Step 9: Check for Overclocking and Thermal Issues

Overclocking CPU or RAM beyond stable limits causes memory corruption BSODs. Enter BIOS and load Optimized Defaults to reset all overclocks. Also use HWiNFO64 or Core Temp to monitor CPU and GPU temperatures — sustained temps above 90°C (CPU) or 85°C (GPU) under load indicate thermal throttling that can trigger instability and BSODs.

Clean dust from heatsinks and fans, reapply thermal paste on the CPU if the system is over 3 years old.