Error code 0xc000021a is one of the common Windows error reported by the users. This error is encountered by the Windows 7, 8 & 10 users basically. The error is the result of different scenarios and accompanied with different error messages. Go through the comprehensive discussion about the symptoms of the error, error messages and possible workaround solutions.
Walk through the various error messages, error symptoms, warnings etc. that are associated with this error.
The 0xC000021A error is also identified as a Blue Screen of Death or BSoD error ( Blue Screen of Death) that happens while the Windows user-mode subsystem is compromised.
Description: The Windows user-mode subsystems are: WinLogon or Client Server-Runtime Subsystem (CSRSS). These 2 sub-systems are compulsory for Windows to perform.
If these are compromised, Windows stops running and will show this error.
Error Message: The error message that is displayed on your screen is commonly this:
“STOP: c000021a {Fatal System Error}.The Windows SubSystem system process terminated unexpectedly with a status of 0xc0000005. The system has been shut down”.
The Windows error 0xC000021A is also known as:
This is the way Windows error code 0xC000021A is displayed on Windows XP, Windows Vista or Windows 7 systems. For the Windows 8, Windows 8.1 or Windows 10 users the error messages can be viewed the same way along with the same error code.
When an error occurs there are multiple reasons for the occurrence of the error. The primary reasons why the error occurs is discussed below. Knowing the reasons help why the error has occurred:
Simple and easy recovery resolutions are recommended for fixing the “0xC000021A” error by implementing the default Automated Repair option. The EasyRE tool is a strong tool that is available for Windows XP, Vista, 7 and 8 users currently. If it is not available it can be downloaded and generated on any other computer. Follow the steps to download and execute the tool.
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Solution I: Start Computer to the “Last Known Good Configuration mode”
In case you start your Windows XP system into the “Last Known Good Configuration mode”, it compels your system to follow the prior saved Windows Registry version: the previous time when your system boot without errors successfully.
The Last Known Good Configuration mode is considered to be a instant fix for the 0xC000021A error.
Follow the below listed points to boot your computer into this mode:
Solution II: Uninstall the Program/Driver Installed Earlier
In case you face the problem after you have installed a fresh software or hardware driver, or any kind of new installation to your Windows XP system, you will have to boot into Safe Mode and then uninstall it. You will have to connect with the manufacturer or check online for an update version of that software or driver that is compatible with Windows XP. Below mentioned step need to be followed to boot Windows XP into Safe Mode:
In case you are unable to boot into Safe Mode, you have to move to fixing the error 0xC000021A with EasyRE tool to resolve the error automatically. You can run EasyRE from any CD, DVD or USB drive.
Solution III: Perform System Restore
In case the System Restore is turned on for your computer, you can attempt and restore the system to a previous restore point. To carry out the system restore process you will have to follow the below listed steps in Safe Mode on a Windows XP system:
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Solution IV: Other Tips & Tricks:
If the above mentioned fixes fails to resolve the Windows error code 0xc000021a attempt the below mentioned tips and tricks that might work on your system. Attempt the below mentioned tips and tricks:
Solution I: Uninstall Earlier Installed Software or Driver:
In case you have installed a new software or program nearly, you will have to boot your computer into Safe Mode and then uninstall it.
Solution II: Run Startup Repair:
The original Windows Vista or Windows 7 installation disc (DVD) that you have comprise of the Startup Repair utility that you can run and try to resolve the 0xC000021A error. Follow the below listed steps to run Startup Repair on a Windows Vista or 7 system:
Solution III: Last Known Good Configuration Mode
Equal to Windows XP suggestions mentioned above, you can attempt to boot to the Last Known Good Configuration mode that will try to perform a earlier error-free version of your system’s registry.
Follow the below listed steps to boot into this mode on a Windows Vista or Windows 7 system:
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Solution IV: Perform System Restore
Once you turn on System Restore on your computer, you may select an earlier restore point to boot into your computer successfully.
In case the Windows 7 0xC000021A error is caused by an incompatible software or driver, System Restore will restore your system to the earlier data when the incompatible software or driver was not installed on your computer. To carry out the same, the System Restore feature needs to be turned on your system before you install the program or driver that is responsible for this error.
If you fail to boot your computer to the Safe Mode to run System Restore, you will have to follow EasyRE tool to fix the error. It is an automated default tool that runs to fix the error via any CDs, DVDs or USB drives.
Follow the below steps to run System Restore in Safe Mode:
In case you have the original installation disc with Windows Vista or Windows 7, you can run System Restore by booting into the installation disc. Then moving to System Recovery Options > System Restore.
Solution V: Last Restore Point by Command Prompt
In case System Restore fails to load, you can run the DISM command to automatically recover the last restore point by implementing the Command Prompt (System Restore must be turn on):
Solution VI: Turn off Services in msconfig
In case the 0xC000021A error code has happened by the program or driver that begins when you start your Windows Vista or 7 system. You can attempt and t, you can try off the Services listed in the System Configuration (msconfig) utility:
In case your system functions with the applied changes the problem might be from one of the services listed in the Startup tab. To resolve the particular error that is causing the problem, boot back into the system and turn on the services listed there one by one and reboot the system till you identify the real service that causes the error.
Solution I: Perform Clean Boot:
For running a clean boot follow the steps listed below. A Clean Boot always authorizes you to resolve the 0xc000021a Windows 8, 8.1. The execution steps are as follows:
In case your system do not display the 0xC000021A error any more, a service listed in Startup might be the problem. To learn the exact service that causes the error you will have to go back to msconfig and turn on each service individually. Then reboot your system till the error crops up again.
Solution II: Uninstall Software/ Drivers:
It is seen that a freshly installed software or driver might be the cause of this error. In case the above solution is feasible for your system you need to uninstall that software or driver that you have installed. Else you can find out online with the manufacturer for an updated version or a version that is compatible with the version of your Windows: 8 or 8.1.
If you fail to boot into your system, attempt booting into Safe Mode and uninstall the necessary software or drivers:
In case you have the original disc, you can use it to boot into Safe Mode:
Solution III: Perform DISM Command:
Start your Windows system into Safe Mode with Command Prompt and perform the dism command by following the steps below:
If you again fail to boot into Safe Mode, go to EasyRE tool to fix the tool.
Solution IV: Perform System Restore:
In case the System Restore was configured on your Windows 8/8.1/1-, you can implement to bring the system to previous time.
If you fail to run System Restore you are again supposed to stop code 0xC000021A with Easy Recovery Essentials default automated tool.
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Solution V: Signature Turn Off:
In case you turn off the Driver Signature, Windows 8/8.1/10 will use drivers that are not signed by Microsoft directly as well. This method functions in case the error cropped by the drivers that are loading at startup.
Solution VI: Reset:
In Windows 8/8.1/10, you can perform a reset of your computer. Prior doing so make sure that:
Go according to the instructions listed below:
Resolving the 0xC000021A error
When the Windows error code 0xC000021A is caused due to an incompatible software or driver that you have freshly installed on your computer, you can can debug it using Dr. Watson software in Windows XP to troubleshoot the error.
These are the instructions on using Dr. Watson to debug the error:
In case there is no log file that was created by the utility software, you can also use the Userdump.exe utility to create a log file:
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If the above resolutions fail to fix the error you can connect with Microsoft customer care support. Else you can also choose to ErrorsDoc.com. It is one of the trustworthy support agency that roofs highly proficient technical support team. They assure you in quick and feasible resolution of the error code 0xc000021a. The team also guarantees resolution in the first call. They are available 24×7 and are easily approachable. Call to the toll free number +1-866-496-0452 to connect with the experienced professionals and garner excellent Windows support.
View Comments
The startup repair did not find any problems with the computer so a system restore to a 6 months back resolved the error 0xc000021a. I did not check the date correctly before the system restore but happy that the issue is fixed. Thanks
The stop code 0xc000021a showed up today. And i followed the perform a system restore and got it fixed. Thanks
Thanks solution number three help me resolve the error code 0xc000021a