The blog of Windows Wally, a Windows Support Technician helping common people solve frustrating computer problems.

How To Fix The Kernel_Security_Check_Failure Error

Reader Question:
“Hi Wally, During the boot up of my windows 8,  I get the ” kernel_security_check_failure ” error and then a frozen screen or the blue screen.“ - Ian T., USA

Before addressing any computer issue, I always recommend scanning and repairing any underlying problems affecting your PC health and performance:

  • Step 1 : Download PC Repair & Optimizer Tool (WinThruster for Win 10, 8, 7, Vista, XP and 2000 – Microsoft Gold Certified).
  • Step 2 : Click “Start Scan” to find Windows registry issues that could be causing PC problems.
  • Step 3 : Click “Repair All” to fix all issues.

Setting up weekly (or daily) automatic scans will help prevent system problems and keep your PC running fast and trouble-free.

Wally’s Answer: The Kernel_Security_Check_Failure error can cause the computer to restart. Blue screen errors like this one can sound really scary when they appear out of nowhere. But, most of them can be fixed easily as long as you note the error message.


The Kernel_Security_Check_Failure or STOP 0×000000139 error appears and the computer restarts unexpectedly.

Kernel_Security_Check_Failure - Cover - BSoD -- Windows Wally


The Kernel_Security_Check_Failure error can be caused by a damaged hard drive, memory, or device driver. It can also result from virus infection.


Here are some ways to fix the Kernel_Security_Check_Failure error:

What To Do If Windows Won’t Start Normally

There is a chance that Windows might not start normally anymore due to this error. In that case, you have two options. The first option is to use safe mode, click here for more info on safe mode. The second option is to boot the computer using a Windows installation DVD/USB. This should be done if the safe mode does not work.

Try Using Automatic Startup Repair

Windows 7 and later versions of Windows will do this automatically after a few restarts. You can also do this manually as well. All you need to do is boot the computer using a Windows installation DVD or USB of the same version as the one installed on the computer. You should be able to find the repair option very easily once the Windows installation disk boots.

KERNEL_SECURITY_CHECK_FAILURE - Repair - Troubleshoot - Startup Settings - Automatic Repair - Windows Wally

Check The Hard Drive To Fix The Problem

  1. Press the Windows Key > type cmd > right-click Command Prompt > click Run as Administrator
  2. In the Command Prompt window, type chkdsk  /f  C: > press Enter

What we just did is was a software-based check. We can also do a hardware-based check on the hard drive by using CrystalDiskInfo. If according to CrystalDiskInfo, the status of your hard drive is red, then you should replace it as soon as you can.

Check The RAM To Fix The Problem

The computer’s RAM or memory can also cause problems and make the computer restart. These problems are usually hardware-based. You can scan and check the RAM using the Windows Memory Diagnostic tool from within Windows by following these steps:

  1. Press Windows Key + R > type mdsched.exe > press Enter
  2. Follow the on-screen instructions

If Windows won’t start then you can run a memory diagnostic scan from the BIOS as well.

Update The Drivers To Fix The Problem

Most blue screen errors result from device driver issues. Many blue screen errors can be fixed by updating all device drivers. You can do this by visiting your computer manufacturer’s website and downloading the drivers from there. You can also use a handy driver utility like DriverDoc to do this for you.

Check For Viruses In The Computer

The computer can start acting funny because of viruses. Although virus infections are rare compared to malware and spyware, they do still exist. The only way to get rid of a virus is to use an anti-virus program. Many of these programs are available for free. A few such examples include AVG, Avira, and Avast.

I Hope You Liked This Blog Article! If You Need Additional Support on This Issue Then Please Don’t Hesitate To Contact Me On Facebook.

Is Your PC Healthy?

I always recommend to my readers to regularly use a trusted registry cleaner and optimizer such as WinThruster or CCleaner. Many problems that you encounter can be attributed to a corrupt and bloated registry.

Happy Computing! :)

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About the Author

Windows Wally is a helpful guy. It’s just in his nature. It’s why he started a blog in the first place. He heard over and over how hard it was to find simple, plain-English solutions to Windows troubleshooting problems on the Internet. Enter: Windows Wally. Ask away, and he will answer.