STACK BUFFER OVERRUN (0X00000066) Blue Screen Fix Guide (Windows 10/11)

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STACK BUFFER OVERRUN (0X00000066) Blue Screen Fix Guide (Windows 10/11)

The STACK BUFFER_OVERRUN (0x00000066) error is a critical system failure that causes your Windows PC to crash and display the dreaded Blue Screen of Death (BSOD). This error occurs when a program or driver tries to write more data into a stack buffer than it can hold, leading to memory corruption. While frustrating, this issue is often fixable with the right troubleshooting steps. Below, well explain what causes this error and provide step-by-step solutions to resolve it.

What Causes the STACK BUFFER_OVERRUN (0x00000066) Error?

The 0x00000066 BSOD typically appears due to:

  • Corrupt or outdated drivers, especially those related to hardware, graphics, or network components.
  • Faulty RAM (memory) that may cause instability in system operations.
  • Malware or virus infections that corrupt system files or drivers.
  • Incompatible or poorly written software, including third-party applications or games.
  • Hardware issues, such as failing storage drives or overheating components.
  • Windows system file corruption due to improper shutdowns, disk errors, or failed updates.

How to Fix STACK BUFFER_OVERRUN (0x00000066) on Windows 10/11

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Method 1: Run System File Checker and DISM

A corrupted system file can trigger this error. Use Windows built-in tools to repair critical files:

  • Open Command Prompt as Administrator:
    • Press Win + X, then select Terminal (Admin) or Command Prompt (Admin).
  • Run the following commands one by one, pressing Enter after each: 
    DISM /Online /Cleanup-Image /RestoreHealth
    sfc /scannow
  • Restart your PC and check if the issue persists.

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Method 2: Check for Faulty RAM

Bad memory can cause stack buffer issues. Test your RAM using Windows Memory Diagnostic:

  • Open Start Menu, type Memory diagnostic tool, and select it.
  • Choose Restart now and check for problems (recommended).
  • Follow the on-screen instructions. If errors are found, replace or reseat your RAM modules.

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Method 3: Update or Reinstall Drivers

Outdated or conflicting drivers often trigger this error. Update them manually:

  • Press Win + X, then select Device Manager.
  • Expand categories like Display adapters, Sound, video and game controllers, or System devices.
  • Right-click each device, choose Update driver, then select Search automatically for drivers.
  • If a driver is marked with a yellow exclamation mark, right-click it and select Uninstall device. Restart your PC to reinstall it automatically.

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Method 4: Run CHKDSK to Check for Disk Errors

A failing hard drive or SSD can cause this BSOD. Scan your disk for errors:

  • Open Command Prompt (Admin).
  • Run the following command, replacing C with your system drive letter if needed: 
    chkdsk C: /f /r /x
  • If prompted to schedule the scan for the next reboot, type Y and restart.
  • After scanning, check for any reported errors in the log.

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Method 5: Scan for Malware

Malware can corrupt system files. Run a full scan with Windows Defender:

  • Open Windows Security, go to Virus & threat protection.
  • Click Quick scan. If threats are found, follow the removal instructions.
  • For thorough scanning, select Scan options and choose Full scan.

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Method 6: Roll Back or Disable Problematic Software

If the error started after installing new software (e.g., a game or driver), uninstall it:

  • Go to Settings > Apps > Installed apps.
  • Find the suspicious app, click it, then select Uninstall.
  • Restart your PC and monitor for improvements.

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Method 7: Check for Overheating or Hardware Issues

Overheating can cause system instability. Ensure:

  • Your CPU/GPU fans are working properly.
  • No dust is blocking airflow (clean vents if needed).
  • External hardware (like RAM sticks) is seated correctly.

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    Method 8: Perform a Clean Boot to Identify Conflicts

    A clean boot starts Windows with minimal drivers/services, helping isolate the cause:

    • Press Win + R, type msconfig, and hit Enter.
    • Go to the Services tab, check Hide all Microsoft services, then click Disable all.
    • Switch to the Startup tab, click Open Task Manager, and disable all startup items.
    • Restart your PC. If no BSOD occurs, re-enable services/apps one by one to identify the culprit.

    FAQ About STACK BUFFER_OVERRUN (0x00000066)

    Q: Will a factory reset fix this error?

    A: A factory reset can help if the issue is software-related, but back up your data first. Go to Settings > Update & Security > Recovery > Reset this PC.

    Q: Is this error hardware or software-related?

    A: It can be either. Start with software fixes (drivers, malware scans) before checking hardware (RAM, overheating).

    Q: Can I prevent future BSODs like 0x00000066?

    A: Yes! Keep Windows updated, avoid pirated/cracked software, and regularly scan for malware. Use reputable driver update tools to stay current.

    Q: Does this error damage my PC?

    A: No, a BSOD doesnt harm your hardware, but frequent crashes can indicate serious issues that may require attention.

    Q: Should I replace my RAM if the error persists?

    A: If memory tests show errors or instability, yes. Try reseating modules first; if the problem continues, consider new RAM.

    By following these steps, you should resolve the STACK BUFFER_OVERRUN (0x00000066) BSOD and stabilize your system. If the issue persists after trying all methods, consult a professional technician for hardware diagnostics.

    Last Updated: December 13, 2025

    Tested on: Windows 10 (22H2) & Windows 11 (23H2)

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