Fatal Error c000021a is a type of Windows stop error also known as the blue screen of death (BSoD) error. When this error occurs, it causes the computer screen to go blue and locks the user out of the current activity.
This error code is fatal and can lead to serious issues like system crashes and freeze.
The error code is usually displayed in the following format:
STOP: c000021a {Fatal System Error}
The Windows Logon Process system process terminated unexpectedly with a status of 0xc0000034 (0x00000000 0x0000000)
Fatal Error c000021a occurs when the Windows kernel detects that either Winlogon.exe or Csrss.exe service processes have stopped responding or failed to load. When this happens the error code pops up on the screen.
Nonetheless, this is not the only reason for the occurrence of this error. There are plenty more reasons why Fatal Error c000021a may pop on your computer screen. These include:
No matter what the reason may be, it is advisable to fix the error right away without any delays. Remember it is a fatal error and can cause a great deal of damage to your PC.
Fatal Error c000021a is a serious PC issue but this does not mean you have to hire an expert to get it fixed. The good news is that this error is actually quite easy to resolve.
You don’t have to be a technical whiz or a computer programmer to fix Fatal Error c000021a on your PC.
Here are some do it yourself methods to fix this error code right away without any hassle:
Let’s get started:
As we mentioned about corrupt or missing drivers can be one of the many reasons for the occurrence of this error. So, check the drivers first. Perform a driver scan and make sure all your drivers are updated.
To do this, first launch Task Manager by pressing CTRL+SHIFT+ESC on your keyboard. Now click on the application tab and then click ‘New Task’ then browse.
After that, go to C:\Windows\System32\Restore folder and then double click the rstrui.exe file. This will help start system restoration. Your computer will reboot during the process and hopefully, the error will be resolved.
Nonetheless, if the error still persists then try methods 3 and 4.
Sometimes Fatal Error c000021a may also occur due to malware infection. Your PC may be affected by viruses hidden in different locations without you knowing about it.
Therefore to resolve this error, it is recommended to run an antivirus and scan for viruses. If detected, remove them right away to fix the error code.
Another method to resolve Fatal Error c000021a code on your system is to repair the registry. The registry stores all the information and activities performed on the system.
If it is not cleaned frequently, it gets loaded with too many files unnecessary and obsolete files like the junk files, cookies, internet history and temporary files which corrupts and damages the registry thereby generating blue screen of death error codes like Fatal Error c000021a.
Though you can repair the registry manually it can be both time-consuming and slightly difficult especially if you are not a computer programmer. Therefore it is advisable to download a registry cleaner to fix it right away.
Whether the Fatal Error c000021a code occurs due to viral infection or registry issues, download Restoro. This is a next-generation, advanced, and multi-functional PC Fixer. This software is deployed with multiple utilities such as a powerful registry cleaner, an antivirus, a system optimizer, and more.
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Simultaneously, the antivirus embedded in this software detects all types of viruses including malware, adware, spyware and Trojans and removes them in seconds.
The system optimizer feature ensures the speed and performance of your PC are not compromised during the repairing process. It ensures your PC works at its optimal speed.
Restoro is a one-stop solution for all your PC needs. It has a user-friendly interface making it easy for all levels of users to work around. It is compatible with all Windows versions
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Error code 0xc004f034 often occurs due to an issue with the Windows product key. This may occur when users enter an invalid product key or use one that is appropriate for use on a different version of Windows. To correct the issue, users will need to use the correct product key for their system or contact an IT professional if their device is connected to a Key Management Service (KMS). Windows users affected by this error code may also need to check their system for viruses or missing system files since these issues can result in error codes on Windows devices.
Manual repair methods enable users to fix problems related to error codes. Though some manual repair methods require the use of Command Prompt and utility tools like the System File Checker, even non-technical Windows users can find success simply by following the instructions provided below.
However, note that some issues can be complex, thus requiring the use of an automated tool or help from a Windows repair technician. Consider these options if the manual repair methods below do not resolve error code 0xc004f034 on your Windows 8 device.
Microsoft currently offers several ways for customers to activate their Windows operating system, the most common of which is the product key. This 25-character code verifies that users have access to an authorized version of Windows.
You may get a valid product key from an authorized dealer, a new PC with Windows, or access a digital copy from a Windows website when you purchase your Windows operating system online. Once you have a valid product key, use it to activate Windows and resolve error code 0xc004f034 in Windows 8. Follow the steps below to access the Product Activation Wizard.
Once a valid product key is used, the Product Activation Wizard should complete the activation process. If you are unable to complete the process, however, and error code 0xc004f034 remains unresolved, click the link or instructions the Product Activation Wizard provides regarding activation via phone or customer support.
Another option available to Windows 8 users is System File Checker (SFC). This tool enables Windows users to scan and repair corrupted or missing system files. Follow the steps below to access SFC.
System File Checker will repair any corruptions found on system files within your machine once you successfully follow the instructions provided. The tool will also replace missing files which will lead to better performance on your PC.
When the process is complete, restart your device then check if you are able to activate Windows. If error code 0xc004f034 is still present, you will need to find another solution via repair method three.
Viruses and other forms of malware are one of the main issues resulting in poor PC performance and Windows error codes. To fix this issue on your PC, scan your machine for signs of these malicious programs. If you do not have anti-malware software and would like to download one from the Internet, ensure the software you choose is effective before attempting to download it.
Once you have powerful antimalware software on your PC, begin a scan for viruses, Trojan horses, and other forms of malware. If the Windows error code occurred due to issues related to malicious programs, you will be able to resolve the issue. If, however, this manual repair method proves ineffective in resolving error code 0xc004f034, download a powerful automated tool or contact a Windows repair technician to assist you.
Some users trying to upgrade from Windows 7 or Windows 8/8.1 reported experiencing installation rollback with error code 0x80070004. This error normally appears when the Computer Name is set to names that can’t be used for the computer. It’s also possible this error occurs if users or program files folder were redirected to a different partition.
The Error code 0x80070004 on Windows 10 is normally caused if any of the following were used as the Computer Name and the user tried to upgrade to Windows 10:
If you don’t solve this error, you won’t be able to upgrade from Windows 7 or Windows 8/8.1 to Windows 10. Note that this error will continuously bring you back to the original OS unless fixed.
Please note that if you’re not confident in doing these steps, you might want to consider seeking the help of an expert or using an automated tool that will help fix this.
Here are a few methods to try.
The most common cause of this error is if your computer uses any of the following reserved names:
These reserved names are not meant to be used as computer names. If this is what your computer uses and you try to upgrade to Windows 10, you will surely get this error. Check your computer name and if you see any of the reserved names, change it right away.
Changing Computer Name in Windows 8.1
If you’re trying to upgrade from Windows 8.1, you can change the name of the computer by following these steps:
Changing Computer Name in Windows 7
If you’re trying to upgrade from Windows, you can follow the steps below to change the name of your computer.
If the first method doesn't work, it probably means the computer name isn’t the cause of this error. Another reason why users experience Error code 0x80070004 when upgrading to Windows 10 is if the “Users” directory was relocated. So, when you try upgrading to Windows 10, the installer wasn’t able to find the user profiles on the “%systemdrive%”, where the current operating system is installed.
If you changed or moved any of the Users, Program Data, or Program Files folders, this will cause the error. Before you upgrade to Windows 10, you might be required to reset or reinstall your current operating system (Windows 7 or Windows 8.1).
If you haven’t made any changes or haven’t moved any of the mentioned folders, there’s a great chance that your users' profiles are corrupted. You can also reinstall your current operating system. However, you might want to check for the corrupter user profile first. To do this, follow the steps below:
On the Users Profiles, make a copy of all the accounts somewhere. Sign out from the current user account then try logging in back using the accounts you’ve copied. For each account, you get an error, delete it. However, make sure that you don’t delete the UpdateUser and Administrator account ever.
After this is done, try upgrading your operating system to windows 10 again.
If the above methods still not useful, you might want to rely on an automated tool. Find a secured and trusted tool. It will help fix this issue.
Problems occur when your PST file becomes corrupted or hits the size limit. Outlook will start to display error messages. These errors include like 0x80040119, 0x80040600, and 0x8004060c.
You might think Outlook problems are just a minor inconvenience. You can’t access your emails and contact information, but that doesn’t actually affect computer security, right? Wrong! Outlook problems can indicate serious corruption issues within your system.
In many cases, your PST file can even be targeted specifically by a virus.
Today, many viruses are specially designed to steal personal information and then sell that information on the online black market. Since so much personal data is stored within Outlook’s PST file, this is often the first place that viruses look.
If you don’t want some hacker in a foreign country to read your emails, steal your contact information, or do all sorts of other dangerous tasks, then we advise you to fix your PST problem as soon as possible.
Other causes include hitting the 2GB memory limit on older versions of Outlook, erroneous SMTP settings, etc,.
PST errors are an incredibly annoying problem. However, thanks to powerful software like Stellar Phoenix Outlook PST Repair, it has never been easier to fix Outlook and recover all of the data inside your PST file. That means that you won’t lose contact information, calendar entries, emails, or any other information stored in Outlook.
ScanPST.exe rarely fixes problems with the PST file. Since the application is only a few megabytes in size, its effectiveness is very limited. Although Microsoft designed ScanPST.exe to be an effective solution to any PST files, it fails miserably.
Ultimately, after downloading ScanPST.exe and running it, your Microsoft Outlook will still be unable to send or receive emails. And, to make matters worse, you might also be unable to access contact data or read your old emails.
Unlike other PST repair solutions, ScanPST.exe will not recover deleted emails or other lost Outlook data. In fact, using ScanPST.exe can sometimes cause your personal data to become even more difficult to recover.
If you do want to try out ScanPST.exe, then go ahead. While it probably won’t make your PST errors worse, it won’t even come close to fixing them. If you’re ready for a more serious solution to PST problems, then keep reading.
You might think Outlook problems are just a minor inconvenience. You can’t access your emails and contact information, but that doesn’t actually affect computer security, right? Wrong!
Outlook problems can indicate serious corruption issues within your system. In many cases, your PST file can even be targeted specifically by a virus.
Today, many viruses are specially designed to steal personal information and then sell that information on the online black market. Since so much personal data is stored within Outlook’s PST file, this is often the first place that viruses look.
If you don’t want some hacker in a foreign country to read your emails, steal your contact information, or do all sorts of other dangerous tasks, then we advise you to fix your PST problem as soon as possible.
Microsoft’s ScanPST.exe application clearly doesn’t work. So what’s the next best option? Well, a program called Stellar Phoenix Outlook PST Repair has been helping PC users solve Outlook problems for several years. As the world’s leading Outlook solution, Stellar Phoenix Outlook PST Repair will quickly and effectively repair any PST problems you encounter.
So how does Stellar Phoenix Outlook Repair work? Well, it starts by finding your PST file. Once the PST file has been found, Stellar Phoenix Outlook PST Repair determines if the file is corrupt or full. It will then repair your PST file either by removing the size limit or by fixing the corrupt files.
Once Stellar Phoenix Outlook PST Repair determines that your calendar appointments, contact data, and emails have all been successfully recovered, it permanently restores access to your PST file.
In fact, Stellar Phoenix Outlook PST Repair can even restore Outlook data that you deleted a long time ago. So, instead of just being a PST error recovery tool, Stellar Phoenix Outlook PST Repair is also a powerful data recovery program.
After letting Stellar Phoenix Outlook PST Repair go to work, open up Outlook and try it out. You’ll have full access to all of your Outlook files and folders, and all of those ScanPST.exe problems will be a thing of the past.
Stellar Phoenix Outlook PST Repair comes with many advantages. Here are just a few reasons why it’s such a popular program:
Stellar Phoenix PST Repair is superior to ScanPST.exe in every way. But Stellar Phoenix’s most important advantage is that it actually works. If you’re ready to quickly fix your Outlook PST errors, then Stellar Phoenix Outlook PST Repair can help. Download it here today to experience the magic of PST repair for yourself.