Thu. May 19th, 2022

Windows 10 and 8.1 had a number of problems when they were first released. Microsoft tried long and hard to fix all the reasons. After a while, when Microsoft started releasing updates. Some bugs were fixed, but there were many that were not. One of these errors is associated with the Windows 10 blue screen error 0xc000021a. Like other Blue Screen Of Death errors, you will see a blue screen indicating that a problem has been detected and your computer will restart.
If you want to know an error, you can search for it online later: 0xC000021a

Sometimes Windows suddenly crashes with a blue screen error while you are working or starting Windows. This error can crash all active programs and force your PC to restart to avoid permanent damage. System displays 0xc000021A Error with a blue screen only when the Winlogon.exe or Csrss.exe files become corrupted due to an internal or external problem. These two files are one of the important system files. Winlogon.exe is responsible for managing the login and logout processes. Csrss.exe belongs to the Microsoft Client or Server ‘Runtime Server Subsystem’.

It means that your PC has encountered a problem and needs to be restarted. This error is displayed in a blue screen of death. Therefore, it can cause serious problems that damage the internal structure of the Windows operating system. This error will persist even after the PC is restarted.

Reason for Windows 10 Bluescreen Error 0xc000021a


This error occurs when a user mode subsystem such as Winlogon or the Client Server Run-Time Subsystem (CSRSS) has been fatally compromised and security can no longer be guaranteed. In response, the operating system switches to kernel mode. Microsoft Windows cannot run without WinLogon or CSRSS. Therefore, this is one of the few cases where the failure of a user mode service can shut down the system.

Aside Error 0xC000021A can occur when Winlogon.exe or Csrss.exe stop working. This happens when:

  • There were corrupted incompatible system files on the computer.
  • An upgrade has failed.
  • Incomplete installation of a software programme.
  • Incompatible device drivers.
  • The installed third-party software file is missing.
  • The system registry is corrupted. (This may occur due to hard disk read / write errors, power failures or virus attacks).
  • Troubleshooting the Windows 10 bluescreen error 0xC000021A


If you are also suffering from this bluescreen error, follow the steps below. These tips will also help you fix bluescreen error codes. So break them one by one.

Access advanced boot options


If your system fails to boot due to that Windows 10 bluescreen error 0xc000021ar then first access Advanced Windows Options. Here you will find many troubleshooting tools like System Restore, Safe Mode Startup Option, Advanced Command Prompt, System Image Restore, Startup Repair etc. Startup repair can help fix this problem. To perform startup repair on Windows 10 and 8.1: First access option for Advanced Startup. To do this, first insert the bootable CD into your media drive and restart the system in BIOS Setup. (To access the BIOS setup, press the Del, F2, F12 or Esc key on the keyboard during the start-up process).

In BIOS Setup, use the right arrow key to switch to the BOOT menu.
Here, change the first boot CD-ROM drive and the second boot to hard disk.
After making changes, press the F10 key to make changes.
When prompted to make changes to the save, select Yes. This restarts the windows.
During the start-up process, press any key to start from CD or DVD. Press any key on the keyboard.
This opens your Windows installation window.
Select Language, Time Currency and Keyboard Input here and click Next on the next screen. Select Repair Computer.
Windows 10 will repair your computer
Now select ‘Select Troubleshooting Now’ in the next screen. On the ‘Troubleshooting’ screen, click ‘Advanced Options’. On the Advanced Options screen (see below), select Startup Repair.