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You are not alone if you are facing an error 0xc000021a Windows 10. Many Windows 10 users face this particular error while booting the PC. A blue screen appears and the computer keeps restarting in a loop of boots. The PC can’t seem to get out of the loop and keeps throwing an error message. Blue screen of Death (BSOD) appears when core system files are damaged or modified. While the error is severe but we can definitely help you in fixing Windows 10 error 0xc000021a. Go through this article to know about effective troubleshooting tips and tricks.


Why Does Error 0xc000021a Windows 10 Occur?

Windows computers are known for throwing errors out of the blue. Error 0xc000021a suggests that Master Boot Loader (MBR) is facing some technical glitches. There could be various reasons behind these issues. It seems like the computer could not complete Windows update properly and affecting the booting process.

Error 0xc000021a Windows 10 occurs when WinLogon.exe is corrupted. This application is responsible for displaying the Windows Login interface after booting the system. Since this error is showing it means, either the login credentials are corrupted or Windows login system is broken.

Further, there can be malware or viruses with high-threat on your PC which may have altered the system files. These core system files are essential for the smooth working of a computer. By default, these files are protected from any alteration. However, due to the high-threat nature of viruses, it breaks the safety protocols and affects the system files.

Having said that error 0xc000021a Windows 10 is not new and it has been a known problem since Windows 7. If you are facing this issue, then don’t worry we are going to help you using this guide.


How To Fix Error 0xc000021a On Windows 10?

Turn on your computer and it will throw error 0xc000021a Windows 10. Let it reboot, the PC collects log files during the process for the system recovery. After reboot, it will again show the same error. Let it reboot for 3-4 times.

When the PC reboots and can’t go through the initial boot, Windows has an inbuilt diagnostic tool which kicks in when abnormal booting is encountered. Let the self-diagnostic tool kick in.


  • After several reboots, recovering Windows will appear. Let it complete a self-diagnosis. If the PC could not troubleshoot on its own then it will provide you with an Advanced option.


error 0xc000021a windows 10


  • Click on the Advanced option and you will see lots of recovery options. Open command prompt and type in “bootrec /fixMBR”. Hit enter to start the recovery process of the master bootloader.


windows 10 error 0xc000021a


  • One by one, type bootrec/fixBoot and bootrec/rebuildBCD and hit enter. All these commands are going to fix the booting errors on your PC. When done with the process, close the window and restart your PC. It should boot fine.


0xc000021a fix


  • If the PC is still showing error 0xc000021a Windows 10 then boot the PC in safe mode. While the PC boots, keep pressing F9 button, it will boot into safe mode. Basically, safe mode is an isolated windows environment where there is no third-party interference. Here, uninstall all the suspicious applications which may be causing the problem.


0xc000021a windows 10 install


  • While the PC is in safe mode, run an antivirus scan and delete all the threatful viruses. Make sure you have deleted the viruses from quarantine as well. Thereafter, simply restart the PC and it should boot without any issue.


0xc000021a windows 10 clean install


Opt For Excellent Service And Recover Your Windows PC

We, Support Numbers are a team of Windows specialist, having fixed thousands of Windows computers in the past. We have been resolving Windows errors for years so we are well acquainted with all the PC issues. Our team is updated with under-the-hood changes in the Windows operating system for a better understanding of the OS. We are an experienced team of engineers and that is what keeps us above the fray. Our technicians can easily fix error 0xc000021a windows 10 in no time.


Reliable Engineers

Engineers at Support Numbers are not only experienced but go through several workshops and training to keep themselves updated with the latest Windows 10 OS. You should not worry about data loss at all, as that is our first priority to recover personal data. Our Windows experts can fix error 0xc000021a windows 10 instantly and make a backup of personal files in a secure device.

Service In Your Preferable Time

At Support Numbers, we work according to our customer’s preference. If you face an error on Windows PC anytime, just make us a call and we will schedule an appointment preferable to your time and place. We also work on-site and provide instant online support.

Inexpensive Service

Support Numbers never overcharge for services. Our support is affordable, keeping in mind our resolution to have a healthy relationship with customers. We charge a fair amount and keep it within budget. We assure you, our technicians will fix your PC without any additional hardware cost.

Contact Us And Get Expert Assistance Right Now

Our Support Numbers is always active, day in and day out. Call us right now and discuss the problem you are facing with our engineers. We may offer some easy solutions to recover from error 0xc000021a windows 10. You can also email us if you have any questions. Or just make use of chat option and talk to our engineers. We assure you, our engineers will fix your Windows PC with all data intact.




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