Kernel Security Check Failure Error Fix Latest Guide 2021

Ever since the invention of computers, the world has developed so much. Also, these systems have been updating themselves with each passing day in terms of software as well as hardware. Moreover, the majority of users who have a PC are either using Windows or Mac OS in their system. In such a fast-paced world, System updates are necessary for every computer and a responsible user always wants their system to be up-to-date. Also, in recent times where millions of users have Windows OS installed on their system, they want to upgrade their system to Windows 10 as soon as possible if they don’t have the latest version.

These updates have essential components that can make the user experience smooth as well as fast. But sometimes, while updating to Windows 10, or after installing Windows 10, many users have complained about the “Kernel Security Check Failure” which is very annoying. If you are experiencing the same issue, then this article has all the answers to your problems.

What Is A Kernel Security Check Failure?

Sometimes when we are updating to windows 10, the system seems to crash and shows a message that says “Kernal Security Check failure” and it is a problem encounter by millions of users around the world. So, if you are facing the same issue, then you must be wondering what is this Kernel Security check failure. Well, sometimes one or several files that help to run the computer fails at integrity check or compatibility check when we are trying to update to Windows 10.

Many reasons can make this issue arise but the most common of them all is the failure of drivers that are present from the old OS version and aren’t supported on the newer version of Windows 10. It can cause panic in you since you don’t know what to do next and your PC is kind of stuck in the process. But you may be relieved to know that you are not the only one who has encountered this issue. And fortunately, there are various ways by which you can tackle this issue and finish the completion of the updating process. But before jumping to the solution, let us first understand its causes.

Why Do We Encounter Kernel Security Check Failure?

While updating to Windows 10, most of the users find this problem of Kernel Security check failure showing a message on the screen. One of the most probable causes of this Kernel Security check failure is the incompatibility of drivers with the current version of Windows 10. This problem is really disturbing. In the first case, your PC might have some compatibility issues with the drivers and it shows the Kernel Security check failure after waking up from sleep. The PC remains in this state until you resolve it.

Also, sometimes when you are trying to upgrade your RAM card, or if you are trying to insert a new RAM card, then this message of BSOD Kernel security check failure shows up on the screen. There are also heavy games that cause the system to crash under some circumstances and games face this issue many times on their Windows 10. And last but not the least, some particular programs that are not compatible with the current OS version trigger the Kernel Security check failure, which shows the error message more frequently. If you are also facing this issue, then the following section has the best solution for this.

How to Fix Kernel Security Check Failure?

Since various reasons cause the Kernel Security check failure in any PC, the solutions vary accordingly. So, to stop code kernel security check failure, at first, you will need to identify the cause or the situation where this issue is arising, and accordingly, you can follow any of these methods described below to solve the issue.

Updating And Fixing The Drivers:

The most common cause for Kernel Security check failure is mismatched drivers. You can update them by:

  • Go to the device manager from your start menu.

  • Then, when you open it, you will see an option for “Update Driver”.

  • Right-click on all the drivers that you want to update, and then a pop-up menu will appear that will ask you to choose the driver update automatically or manually.
  • You will need to select the “search automatically for drivers “and then after the drivers get updated, restart your computer.

System File Checker And Memory Diagnosis:

To perform this method, follow these steps:

  • First, restart the computer by going through the boot menu and tap on the “Troubleshoot” option. 

  • From there navigate to Advanced Options>Startup Settings.

  • Then you will see a restart button at the bottom right side. Click on that and you will be now able to start your PC with minimum system requirements.
  • Now go to the search bar and type “Windows Memory Diagnostic Tool” and run it as administrator. 

  • Select the “Restart Now” option and check for problems. Then it will show you the possible reasons which you will need to solve and boot your system normally.

Updating The System:

It is one of the most basic ways of solving the blue screen Kernel Security Check failure if it is persistent on your device. To do that:

  • Go to the search bar and type “Update & Security”. Then click on check for updates.

  • If there are any updates available, then it will ask you to download them.
  • After you download the updates, allow the system to install the updates and your system will be back to normal.

Scan Viruses:

Viruses can be a big reason why your system might be experiencing such an issue. To solve this, you will need to scan the PC for viruses:

  • Go to the taskbar and on the search icon, type “Windows security”. 

  • You will see a Shield icon on the left screen when you click on that. It is the tab for “Virus and threat protection”.

  • Click on that and you will see an option to scan. This will scan your computer for viruses.

  • After you are done, restart the PC.

Running PC In Safe Mode:

To run your PC in safe mode, follow these steps:

  • Click on the search button and type “Recovery” or else go to the Windows menu and navigate Update & Security>Recovery.

  • Then click on that and you will see an option “Troubleshoot”. Then navigate to advanced options and Click on a “Restart now” button visible on the bottom right corner.

  • After the restart, your PC will work in safe mode and Kernel Security check failure won’t bother you again.

Enable Legacy Mode:

If none of the methods work, then you can enable the legacy mode to solve the issue. The steps to do that are:

  • Restart the system and insert a Windows 10 media file drive that can boot.
  • Then find the “Windows setup box” that is displayed on your screen.
  • Click on the Next button and select “Repair your computer”.

  • Then chose Troubleshoot>Advanced options>Command Prompt.

  • Type “BCDEDIT/SET{DEFAULT}BOOTMENUPOLICY LEGACY” and hit enter. When this process gets done, you have to restart the computer.

Frequently Asked Questions:

  • How do I fix the Kernel Security check failure?

Several methods can be used to solve the issue of Kernel Security check failure. All of them have been explained in this article with detailed steps.

  • What are the causes of Kernel security check failure windows 10 install?

This issue occurs when the software that is updating in the system gets conflicted with the existing drivers for hardware.

  • What is meant by stop code Kernel Security check failure?

It is one of the stop codes that makes your computer screen turn blue and show the error message thus making you unable to work with the system.

  • What is meant by 0xc000021a?

This is a type of stop error that turns the screen blue and displays a message “Your PC is having some issues and needs to restart”.

  • Are these methods going to harm my PC?

No, these methods have been tested by millions of users around the world and are safe to use. If you are experiencing Kernel Security check failure in your PC, then you can follow any of these methods to get rid of this issue.


One of the key features of updating to Windows 10 is that it brings speed and functionality to every computer that can help the user experience fast-paced processing. But sometimes this error for Kernel Security Check Failure occurs. It can happen because of various reasons that can make this issue persist. Most of the users think that their system is stuck, but if you analyze the problem as mentioned in this article and follow any solution from the above sections, you will be able to easily solve this problem. In case it persists, feel free to contact the service center.



My name is Sean and I started this project in 2020. It has been growing ever since. I am a serial tech entrepreneur and a tech geek. My experience in blogging and technology helps me understand what type of content people are looking for and I intend to provide the information in the best possible way.

Leave a Comment

Your email address will not be published. Required fields are marked *

Sign up for our Newsletter

Don’t miss new updates on your email !

Scroll to Top