Fix Critical Structure Corruption BSOD in Windows 10

The Critical Structure Corruption bug check (0x109) in Windows 10 is a Blue Screen of Death (BSOD) that indicates the kernel detected a corrupted critical data structure. The fix usually involves updating or rolling back drivers, running system file checks, and checking for hardware faults, with the most common culprit being a faulty or incompatible driver.

What Is the Critical Structure Corruption Error?

This specific Stop code appears when the Windows kernel detects that a critical data structure—such as a list of loaded drivers, a registry hive, or a process object—has been corrupted in memory. Unlike a simple application crash, this corruption can happen at any time, often during startup, while gaming, or when waking from sleep. The error is typically caused by a driver writing to the wrong memory address, faulty RAM, or a corrupted system file.

Common Causes and How to Diagnose Them

Before jumping into fixes, it helps to know what you are dealing with. The most frequent triggers are:

Outdated or incompatible drivers—especially graphics, network, and storage drivers.
Corrupted system files—often from a failed Windows update or disk errors.
Faulty RAM—bad memory cells can corrupt data structures at random.
Overclocking instability—an unstable CPU or memory overclock can cause intermittent corruption.
Third-party security software—some antivirus or firewall drivers hook deeply into the kernel and can trigger this error.

To narrow it down, check the Windows Event Viewer (under Windows Logs > System) for the exact time of the crash and any related warnings. Also, note whether the crash happens during a specific activity—like gaming or plugging in a device—which can point to a particular driver.

Step-by-Step Fixes

Work through these fixes in order. Most users resolve the issue with the first two steps.

1. Run the Windows Memory Diagnostic

Since RAM corruption is a prime suspect, test your memory first. Press Win + R, type mdsched.exe, and press Enter. Choose “Restart now and check for problems.” Windows will restart and run a memory test. If it finds errors, replace the faulty RAM module(s). If it finds nothing, move on.

2. Update or Roll Back Drivers

Outdated or recently updated drivers are the most common cause. Open Device Manager (Win + X > Device Manager) and look for devices with a yellow warning icon. Right-click each and select “Update driver.” For hardware that was working before a recent update, try “Properties > Driver > Roll Back Driver.” Pay special attention to:

Graphics card drivers (NVIDIA, AMD, Intel)
Network adapters (Wi-Fi and Ethernet)
Chipset and storage controllers

If you recently installed a new driver, roll it back or visit the manufacturer’s website to download the latest stable version—avoid beta drivers.

3. Run System File Checker and DISM

Corrupted system files can also cause this error. Open Command Prompt as administrator (right-click Start > Command Prompt (Admin)) and run:

sfc /scannow — this scans and repairs protected system files.
If that doesn’t help, run DISM /Online /Cleanup-Image /RestoreHealth — this fixes the system image that SFC relies on.

Restart after each command. These tools can take 15–30 minutes, so be patient.

4. Check for Disk Errors

Bad sectors on your hard drive or SSD can corrupt data structures. Open an elevated Command Prompt and run chkdsk C: /f /r. You’ll be prompted to schedule it for the next restart—type Y and restart. Windows will scan and attempt to repair disk errors before loading the OS.

5. Disable Overclocking and Test Hardware

If you overclocked your CPU, GPU, or RAM, revert to default settings in the BIOS/UEFI. An unstable overclock can cause exactly this type of corruption. If the BSOD stops, you’ve found the culprit—either lower the overclock or keep it at stock. For RAM, you can also run a more thorough test with MemTest86 (bootable USB) to catch errors the Windows tool may miss.

6. Uninstall Recently Installed Software

If the error started after installing a new program—especially a driver updater, VPN, or antivirus—uninstall it. For third-party antivirus, use the vendor’s removal tool to ensure all kernel-level drivers are gone. You can also boot into Safe Mode (Shift + Restart > Troubleshoot > Advanced options > Startup Settings > Restart > press 4) to see if the error occurs there. If it doesn’t, a third-party driver is almost certainly the cause.

7. Perform a System Restore or Reset

If nothing else works, use System Restore to revert Windows to a point before the errors began. Type “System Restore” in the Start menu and choose a restore point. If you don’t have any, or if the error persists, you may need to reset Windows (Settings > Update & Security > Recovery > Reset this PC) while keeping your files.

Frequently Asked Questions

Can a faulty power supply cause this BSOD?

Yes, though less commonly. An unstable or failing PSU can cause random memory corruption. If you’ve ruled out drivers and RAM, and the error occurs under load, consider testing with a known-good power supply.

Is Critical Structure Corruption caused by a virus?

Rarely, but some rootkits and low-level malware can corrupt kernel structures. Run a full scan with Windows Defender or a reputable on-demand scanner. If you suspect malware, use Windows Defender Offline scan.

Will updating Windows fix this error?

Sometimes. Microsoft regularly patches bugs in the kernel and drivers. Check for updates in Settings > Update & Security > Windows Update. If a recent update caused the issue, you can uninstall that specific update.

How do I find the exact driver causing the crash?

Use the BlueScreenView tool (free from NirSoft) to analyze the minidump files in C:\Windows\Minidump. It shows the driver names and addresses involved in the crash. You can then update or disable the specific driver.

Is it safe to keep using my PC if I get this error occasionally?

Not recommended. Even occasional crashes can indicate a failing component. Continuing to use a PC with faulty RAM or a corrupted system can lead to data loss. Fix it as soon as possible.

General steps for current mainstream versions; menus can differ by device and version. See the disclaimer or report an error.

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