Easily Fix Error 0xc000021a on Windows 10

Windows 8/10 had a number of problems when it was first released. After a while, when Microsoft started releasing updates, some bugs were fixed, but many of them were not. One of these errors is related to the hexadecimal code 0xc000021a.

It indicates that your PC has encountered a problem and needs to be restarted. This error appears in a blue screen of death. It can therefore have serious problems that damage the internal structure of the Windows operating system. This error persists even after rebooting the PC. System recovery does not work either. So you would certainly want to know the reason for this hilarious error message.

Reasons for error 0xc000021A:

This problem occurs when Windows is upgraded. So, after the update, it does not start under Windows and displays this BSOD blue screen of death with an error. There are two files that are the main cause of this error. These files are listed below.

  • winlogon.exe: As the file name indicates, this file is responsible for the logon and logoff processes within Windows. This file may be damaged by improper adaptation of system files or third-party software. If this file is corrupted, this error will cause the PC to boot on Windows login.
  • csrss.exe: The second file that causes this error is Csrss.exe. This .exe file belongs to Microsoft Server or Client. This file can also be damaged by this error.

To correct installation error 0xc000021a under Windows 10

  • Create a bootable disk with genuine version of Windows.
  • Unplug all devices
  • Upgrading via the operating system
  • Run SFC
  • Reconstruction of the BCD
  • Application of disabled driver’s signature
  • Check the hard disk drive status

Solution 1 – Create a bootable disk with genuine version of Windows.

Let’s start at the beginning. If you can reinstall Windows 10 on another PC, you must try it. This is the best way to check if your bootable drive is bootable. The procedure is the same for the DVD or USB stick, i.e. if you can boot on at least one PC, the problem is on the other PC and the installation drive is probably properly configured and created.

On the contrary, if you cannot boot to a specific device, be sure to create and reboot the bootable disk from scratch with the Windows 10 installation. If you are not sure how to do things correctly, follow these steps:


  1. Download the media creation tool here: https://www.microsoft.com/en-us/software-download/windows10.
  2. Connect the USB stick with at least 4 GB.
  3. Launch the media creation tool and accept the license terms.
  4. Select “Create installation media (USB stick, DVD or ISO file) for another PC”.
  5. Select the desired language, architecture and edition.
  6. Click Next.
  7. Select USB Drive and click Next.
  8. Wait for the installer to download the files and finally you have a properly created and configured bootable drive with the Windows 10 installation.


  1. Download the media creation tool.
  2. Launch the media creation tool and accept the license terms.
  3. Select “Create installation media (USB stick, DVD or ISO file) for another PC”.
  4. Select the desired language, architecture and edition.
  5. Click Next.
  6. Select the ISO file.
  7. Save the ISO file to the location of your choice and wait until the download is complete.
  8. Insert a DVD and use any third-party burning program to create the Windows 10 bootable DVD.

Solution 2 – Unplug all devices

Another possible aggressor, which can certainly cause critical system errors, are the devices. Devices may occasionally cause the charging process to stop. In addition, this shutdown may cause more than a few errors, including the crash of the blue death screen with the error code “0xc000021a” provided.

Make sure that only the mouse, keyboard and monitor remain connected when you boot from a USB stick or DVD. You should disable everything else, just in case one of the secondary devices prevents Windows 10 from installing.

However, if you still can’t get started, check the extra steps.

Solution 3 – Upgrade via operating system

With the introduction of Windows 10, users have several options when it comes to upgrades. You can use the Windows Media authoring tool to upgrade to Windows 10 without removing the current system. How does that solve your problem?

Well, some users managed to solve the problem by installing an older Windows iteration, then upgrading to Windows 10 using the media creation tool. For no apparent reason, this helped them overcome the boot bug that plagues so many Windows users.

If you are not sure how to proceed, follow the steps below and we should be ready to go:

  1. Download the media creation tool.
  2. Launch the media creation tool and accept the license terms.
  3. Select Update this PC and the download should begin.
  4. RECOMMENDED: Click here to solve common PC problems and speed up your system.
  5. Once the files are downloaded, Media Creation starts the update.

Solution 4 – Run SFC

Sometimes system file corruption can lead to a world of problems in many departments, including reinstallation of Windows 10, and virus infections or integrity problems can damage some boot files, ultimately leading to critical system failure. Just like the installation error, which has the code 0xc000021a.

There are several ways to fix this, but the best way to overcome this and other similar problems is to use System File Checker and look for errors. It is also strongly recommended to run a full scan with a third-party antivirus program to remove malware infections. After dealing with the malware, follow these steps to use the SFC tool:

  1. Right-click on the Start menu and run the command prompt (Admin).
  2. Enter the following command on the command line and press Enter: sfc/scannow
  3. Wait until the scanning is complete and look for improvements.

If that wasn’t enough, be sure to continue with the additional solutions we’ve outlined below.

Conclusion of 0xc000021a BSOD on Windows 10

I hope you managed to fix this BSOD error 0xc000021a on your Windows 10 machine. I created this post by adding my personal experience with this bug, and I also spent hours searching for this bug online by finding many fixes that I listed here. I hope this article has been helpful to you, I would be interested by your comments in a comment below. I would also be very grateful if you would share this article via the links below.