Fix Stop: C000021A Fatal System Error

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BSOD is a common problem for windows users. There are several blue screen of deaths you may experience. But Fatal System Error C000021A is a bit different. Modern Windows like 10 or 8 users face it less than older windows users. From Windows XP to 7, This issue can be a major problem for anyone. But it can be occurred on any versions. It is also known as Stop error. Let’s know in details.

STOP: c000021a {Fatal System Error} Symptoms:

It appears as blue screen of death or kernel error anytime. Specially, It may occur immediately after startup of your PC and restart. Even, It occurs in safe mode. So, It different than other BSOD. Normally, Other BSODs don’t appear in safe mode. Normally, It appears with a message like this –

STOP: c000021a {Fatal System Error}
The Windows Logon Process system process terminated unexpectedly with a status of 0xc06d007e (0×00000000 0×00000000).
The system has been shut down.

What Causes Fatal System Error C000021A:

When your windows kernel detects Winlogon.exe or Csrss.exe services have been crashed or stopped, You will see this BSOD Fatal error. So, These are reasons behind this BSOD. These two services may be affected by following things –

  • Missing or corrupted drivers.
  • Faulty RAM.
  • Corrupted System Files.
  • Invalid and corrupted registries.
  • Third-party programs.
  • Virus problem.
  • Power Supply Unite (PSU) problem.
  • Service Pack installation failure.
  • Improper system restore.

How to Fix Stop: C000021A Fatal System Error:

Repairing this error can be so easy. Again it can be so complex and you may need other’s help. Anyway, I’ll tell you the most working methods to fix this windows BSOD.

Method 1: Remove Recently Install Programs & Drivers

At first you have to remember one thing. That is from when you have been facing stop BSOD erro C000021A. If it is after recent changes of your Windows i mean after installing any software or specific drivers, Then uninstall them. Because, They may have incompatibility issue with your windows version. It may make stopped Winlogon.exe or Csrss.exe or conflict with them. As a result, You may face many troubles including kernel blue screen errors. So, If you want to solve this problem, You should consider uninstalling the recent programs or drivers. It may help you.

To uninstall any programs –

  • Just go to Control Panel > Programs > Programs and Features.
  • You will see a list of installed programs of your PC. Remove the recent one which you installed before facing fatal system error.

To uninstall drivers –

  • Press Windows Logo Key + R to open RUN.
  • Type devmgmt.msc and press Enter.
  • Now you will see a list of your drivers of PC. Double click the recently updated or installed driver.
  • It will open its properties. From there click on Driver tab.
  • Now click on Uninstall. You also can consider clicking on Rollback driver, If you are facing BSOD after updating that driver.

Method 2: Rollback Driver & Remove Recent Windows Update

If you face STOP: c000021a {Fatal System Error} after updating a specific driver, I would like to suggest you to rollback to its previous version. It is very easy to.

  • Just open Device Manager and open that driver’s properties as i mentioned in first method.
  • Now click on Driver tab.
  • Now click on Rollback driver and follow further instructions.

If you face this problem right after installing recent windows update, I must suggest you to uninstall these updates from your PC. To do it-

  • Navigate to Control Panel > Programs > Programs and Features.
  • Now click on View Installed Updates. You will find it on left sidebar.
  • Now uninstall the recently installed update.

Method 3: Update Windows & Drivers

Incompatibility issue can create many problems in windows. If your drivers are out dated, update these to latest version. Even, Always keep your windows up to date. You can update your drivers from device manager.

Method 4: Last Known Good Configuration

This is another working method to fix fatal system error C000021A. To get started follow the instructions below –

  • Open Start Menu. Then Click on Restart.
  • After turning off your PC when text appears in your screen, Press F8. It will open Advanced Boot menu. Choose Last Known Good Configuration and press Enter. F8 won’t work for windows 8 and 10. In that case, You have to open advanced boot menu differently. To know details, Read Method 3: Shift+Restart Method from this article: https://www.xtremerain.com/boot-into-safe-mode-in-windows-10/

Last known good configuration method should work for you. If it doesn’t resolve your fatal system error, Follow next methods.

Method 5: Run Check Disk

If your hard disk bad sector is responsible for this stop error C000021A, It will fix it. You just need to –

  • Open Command prompt by pressing windows logo key + R from keyboard.
  • Type CHKDSK /R C: and press Enter. C: is for Local disk C. You can change it for each drives.
  • After that you may be asked to restart PC. Type and press Enter.
  • It will restart and fix your hard disk problem.

Method 6: Fix Memory Problems

You should diagnose and fix your memory problems. Because, RAM problem may create this problem. This article may help you: http://windows.microsoft.com/en-us/windows7/diagnosing-memory-problems-on-your-computer

Method 7: Repair Corrupted System Files

I would like to refer this article: https://www.xtremerain.com/repair-corrupted-system-files/

In that article, You will find every instruction to fix corrupted system files, to do system restore & reset.

Method 8: Fix or Replace Power Suply

If there is something wrong with your power supply, You may face Stop: C000021A Fatal System Error. You may have several secondery or extra component like DVD Rom, internal cooling fan etc. You can detach some unnecessary component and check your PC. If it solves your problem, You may have new power supply with high ability.

Source: http://www.compuchenna.co.uk/fatal-system-error-c000021a/

https://support.microsoft.com/en-us/kb/156669

If you know any better solution, You can share with us.

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