Almost every Windows users have at least once encountered a critical error and result in a Blue Screen of Death (BSOD). The stop code KERNEL SECURITY CHECK FAILURE shows on a BSOD means: a specific file has not passed Windows checking of integrity or compatibility.

On Windows 10 or 8 powered computers, the error may occur during or at the end of a driver or Windows update. A faulty memory or driver is the cause that could trigger the error, and users can not boot into Windows environment in most reported cases.

In this post, I list several methods for you to fix the KERNEL SECURITY CHECK FAILURE error. You may not need to apply all the methods, but you should try by order, start with 1. If you are not allowed to boot into Windows environment normally, so the first step is to boot into Safe Mode in Windows 10 or Windows 7.

Method 1: Roll back a Windows or driver update

If the problem occurs during or after a Windows or driver update, try to roll it back. 

Roll back a Windows update

  1. By hitting the keyboard shortcut ‘Windows + I’, you will open Setting window, then select ‘Update & Security’;

  1. Make sure ‘Windows Update’ on the left sidebar is selected, then select ‘View update history’;

  1. Select ‘Uninstall updates’ link to open ‘Installed Updates’ window;

  1. In the ‘Installed Updates’ window, scroll down to ‘Microsoft Windows’ section. Right-click and choose Uninstall (or just double-click) the most recent update to uninstall it.

Now restart your computer normally to see if the KERNEL SECURITY CHECK FAILURE error if fixed.

Roll back a driver update

  1. Open the Power User Menu by pressing ‘Windows + X’  then click ‘Device Manager’;

  1. Find the device that you have updated its driver recently, right-click it and choose Properties;

  1. On Properties windows, move to Driver tab then select ‘Roll Back Driver’ button. If it’s disabled, download an older driver version for your device from manufacturer’s website then install it.

Method 2: Check your RAM using Memory Diagnostic Tool

As mentioned, the KERNEL SECURITY CHECK FAILURE error may be caused by faulty memory. Hence, check your RAM by using Windows Memory Diagnostic may help to confirm. Here how to do it:

  1. Open Start menu by hitting Windows key and search for ‘memory’, then select Windows Memory Diagnostic in the results;

  1. Memory Diagnostic window will open, select ‘Restart now and check for problems’ option;

  1. Follow instructions to complete the checking process.

If it returns that your RAM has a problem, try to pull out then install it again. Check for the error is fixed or not.

Method 3: Scan your system using System File Checker (SFC)

Corrupted system files also could be the cause of the KERNEL SECURITY CHECK FAILURE error. So scan your system with SFC to find and restore for corrupted system files may solve the problem.

  1. Bring up the Start menu, then type ‘cmd’ to search, right-click Command Prompt and select ‘Run as Administrator’;

  1. Type in the Command Prompt window ‘sfc /scannow’ command and hit Enter key;

  1. When the scanning process completes, restart your PC. This process will replace all corrupted files on reboot.

Method 4: Scan your hard drive to fix KERNEL SECURITY CHECK FAILURE error

  1. Start Command Prompt as Administrator by right-click Start icon then choose Command Prompt (Admin). If you are running Windows 10 Creators Update and later, you may notice that Command Prompt is not on the Power Users menu, you can put it back easily;
  2. Type in ‘chkdsk /f /r’ command, hit Enter key, then press Y to set schedule. The disk check process will take action the next time you boot your PC.

If you don’t have time to wait for the disk check to complete (could be a day for some), you can skip it and reschedule it again at a suitable time.

Method 5: Restore your system using System Restore

This is a very powerful tool, it can easily fix a lot of problems, including the KERNEL SECURITY CHECK FAILURE error. If you have a restore point where your system at a well-performing state, System Restore can revert your system to that point, hence fix the error. To use it:

  1. Hit the ‘Windows + I’ shortcut to open Setting window, then select System;

  1. On the left sidebar, scroll down to find and select About, then choose ‘System info’;

  1. A System window will open, click ‘System protection’ on the left sidebar;

  1. System Properties window should open, make sure you’re in System Protection tab, then click ‘System Restore…’ button;

  1. Click ‘Next >’ button;

  1. Select a point when your system at well-performing state, then click ‘Next >’ button;

  1. Click Finish button to start the restoring process.

If the KERNEL SECURITY CHECK FAILURE error persists after the restore process, the only option left to fix it is to do a clean install of Windows. In Windows 7 and earlier, you will need an installation dics, but in Windows 10 or 8, you have Reset this PC feature assistance.

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