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How to Fix Fatal Error c000021a

Fatal Error c000021a - What is it?

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)

Solution

Restoro box imageError Causes

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:

  • Missing or corrupt hardware drivers
  • Faulty hardware
  • Windows System Restore failed during the rollback process
  • Malware or viral infection
  • Registry issues

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.

Further Information and Manual Repair

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:

Method 1: Update Your PC Drivers

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.

Method 2: Perform a Windows System Restore

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.

Method 3: Scan for Viruses

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.

Method 4: Repair the Registry

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.

Automatic Repair with Restoro.

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.

The registry cleaner scans the entire PC and detects all types of registry issues at once. It cleans the registry, wipes out all the unnecessary files, and restores the registry back to normal.

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

Click here to download Restoro and resolve the Fatal Error c000021a code on your PC today!

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Computer gets stuck on Preparing to configure
If you suddenly find your Windows 10 computer stuck on the “Preparing to configure” screen for quite a long time now after you run Windows Update, read on as you will be guided on how you can fix that issue in this post. During an update process, there’s a lot of things that go on in the background which is why Windows Updates take quite a while before it finishes. It can be at 25%, 50%, or even 100% but the only message you’re going to see on your screen is the “Preparing to configure Windows, Don’t turn off your computer”. However, if you notice that the Windows Update is taking a longer time than it’s supposed to, the first option is to wait some more but if it’s still the same, then there’s definitely something wrong. This kind of issue occurs when Windows Update fails to configure in short correctly download and install the update. When this happens, it will revert all the changes which are why you were advised to wait for a couple of hours. There are two possibilities why your computer is stuck on the “Preparing to configure Windows, Don’t turn off your computer” screen. The first one is that the Windows 10 operating system is installing any updates. The second one is when the user profile takes time to load or encounters an error. There are several options you can try to fix the problem. You can try running System Restore or boot your computer in Safe Mode or repair the corrupted profile via Registry Editor. You might also want to try using installation media to boot and repair your computer if the other options didn’t work.

Option 1 – Perform System Restore

  • Tap the Win + R keys to open the Run dialog box.
  • After that, type in “sysdm.cpl” in the field and tap Enter.
  • Next, go to the System Protection tab then click the System Restore button. This will open a new window where you have to select your preferred System Restore point.
  • After that, follow the on-screen instructions to finish the process and then restart your computer and check if the problem is fixed or not.
Note: If you can’t boot into the desktop of your computer, you can run System Restore in the Advanced Startup Options by following these steps:
  • Boot your computer into the Advanced Startup Options screen.
  • From there, you will see some options to troubleshoot when you can’t log in to Windows in the usual way.
  • Now select Troubleshoot > Advanced Options > Command Prompt.
  • After that, type “rstrui” and hit Enter to execute the command which will start the System Restore process.
  • Once it’s done, restart your computer.

Option 2 – Boot your computer in Safe Mode

You can try to tap the F8 key if you have it enabled in your Windows 10 computer, as you start your system to boot into Safe Mode. Once your computer is in Safe Mode, you can access the Start Menu and the Mouse and Keyboard. Aside from that, you can also access your files and other built-in tools in Windows such as Command Prompt, PowerShell, Computer Manager, Device Manager, Event Log Viewer, and many more. On the other hand, if you haven’t enabled the F8 key, you can just go to the Advanced Startup options to boot your computer into Safe Mode. Once you’re there, select Troubleshoot > Advanced Options > Startup Settings > Restart > Tap the number 4 key. After that, your computer will restart in Safe Mode. If you want to reboot into Safe Mode with Networking instead, you can tap the number 5 key and for Safe Mode with Command Prompt, tap the number 6 key. Once your computer is in Safe Mode, you can use any of the built-in tools to restore your computer or troubleshoot the problem that’s causing your computer to get stuck at the “Preparing to configure” screen.

Option 3 – Try to repair your corrupted profile via Registry

In this third option, you can try to repair the corrupted profile using the Registry but before you proceed, take note that you can only try this if you can boot into your desktop and if you can, make sure to create a System Restore Point and then follow the steps below.
  • Tap the Win + R keys to open the Run dialog box.
  • Then type “Regedit” in the field and hit Enter or click OK to open the Registry Editor.
  • Next, go to this registry key: ComputerHKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NTCurrentVersionProfileList
  • Once you’ve opened the registry key, you should see a list of all the user profiles on your computer. Now click on each S-1-5 folder and look for the “ProfileImagePath” entry and double click on it to check which user account it is related to. You will see a path like “CUsersACK” where “ACK” is the username.
  • You should know which of the user account is corrupted. Just look for a key named “RefCount” and change its Value data to “0” and click OK. And if it isn’t available, simply right-click on the right pane and create it.
  • After that, double click on the key named “State” and make sure that the Value data is “0” and click OK.
  • Exit the Registry Editor and restart your computer to apply the changes made.

Option 4 – Try to use installation media to boot and repair your computer

Another thing you can try to resolve the issue is to use the Windows installation bootable media so you can boot and repair the operating system. To use it, follow these steps:
  • You need to first create an installation media which has the dame version of the operating system installed in your computer.
  • After that, once you reach the Install Windows screen, click on the “Repair your computer” link.
  • Wait until the repair is completed and then shut down your computer
  • Now once your computer has restarted, check if it can now boot properly.
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Option 1 – Turn off or turn on app launch tracking via Settings

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Option 2 – Turn off or turn on app launch tracking via Windows Registry

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HKEY_CURRENT_USERSOFTWAREMicrosoftWindowsCurrentVersionExplorerAdvanced
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  • Now click OK and restart your computer.
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Fixing Windows 10 stuck at “Preparing Security Options”
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Option 1 – Try using System Restore

You can do this option either by booting into Safe Mode or in System Restore. If you are already in the Advanced Startup Options, just directly select System Restore and proceed with the next steps. And if you have just booted your PC into Safe Mode, refer to the steps below.
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  • After that, follow the on-screen instructions to finish the process and then restart your computer and check if the problem is fixed or not.

Option 2 – Uninstall the Windows Updates you’ve installed recently

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Option 3 – Try disabling the Fast Startup

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Option 4 – Try running both the SFC scan and CHKDSK utility

You can do both SFC and CHKDSK using Safe Mode and Advanced Startup options. For Advanced Startup options, click on the Command Prompt option and proceed with the steps. And if you have booted your computer into Safe Mode, follow these steps:
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  • After that, type in this command and tap Enter to run the System File Checker or SFC – “Sfc /scannow”.
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  • Wait until the SFC scan is done with the process and then restart your PC.
  • Next, run the CHKDSK utility and once it’s done checking your disk for errors and then reboot your PC to save the changes made.

Option 5 – Try resetting Windows 10

You can reset your Windows 10 PC using either the Advanced Startup Options or by booting into Safe Mode.
  • Tap the Win + I keys and go to Update and Security > Recovery.
  • Then click on Get Started under the Reset this PC section.
  • After that, follow the on-screen instructions with how you want to reset your PC and what files and settings you want to revert.
  • Then it will reset your PC by reinstalling it

Option 6 – Try to rename the SoftwareDistribution folder

In this option, the Command Prompt is supposed to be like the one in option 4. You can use both ways there to open the Command Prompt.
  • Open an elevated Command Prompt as admin and type in the commands below and tap Enter right after you typed in each one of them
  • net stop wuauserv
  • net stop bits
  • rename c:windowsSoftwareDistribution SoftwareDistribution.bak
  • net start wuauserv
  • net start bits
Note: You can also rename the SoftwareDistribution folder to “SoftwareDistribution.bak” or “SoftwareDistribution.old” after you boot your PC into Safe Mode.

Option 7 – Try rebuilding BCD

Rebuilding the BCD can help you in fixing the stuck Windows 10.
  • You can start by booting into the installation environment for Windows 10 from an installation media.
  • After that, click on Repair your computer and on the blue screen, select Troubleshoot and then select the Advanced options menu.
  • Next, select Command Prompt and type in the commands below one by one, and tap Enter right after you do so.
  • exe /FixMbr
  • exe /FixBoot
    • exe /RebuildBcd

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Oculus Quest 2

occulus quest 2 VRWith its Rift model, Oculus set itself as a big player in VR. Now the company is slowly bowing out of the dedicated, tethered VR headset with its latest Quest 2 designed to primarily be a standalone headset. In case you do not know, tethered headset means that the headset itself is connected to your PC and is using its power to drive your VR experience. Now technical specifications of Quest 2 are pretty OK and it can drive stuff pretty decently and if you want you can purchase the dedicated cable to connect it to your PC for the full experience of games requiring more capable hardware. Oculus Quest 2 is the cheapest headset on this list and with its stable performance, is highly recommended.

Valve Index VR

valve index vrAlthough the headset itself is nothing revolutionary or special its controllers are. They can track individual finger movements, making games (that take advantage of them) much more immersive than the standard trigger grips on other controllers. The Index's higher refresh rate makes for smoother action, as well, which is another nice bonus. If you already have an HTC Vive or Vive Cosmos Elite, and their base stations (not the regular Cosmos), you can buy only the controllers.

Sony PlayStation VR

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HP Reverb G2 VR

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HTC Vive Cosmos

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“Windows is unable to reach your company’s activation service. Please connect to your corporate network. If you are connected and continue to see the error, contact your system administrator. You can also click on the error detail to find the exact error. Error code: 0xC004F074.” “Activating Windows(R), (Key hash)… Error: 0xC004F074 The Software Licensing Service reported that the computer could not be activated. No Key Management Service (KMS) could be contacted. Please see the Application Event Log for additional information.” “Error 0xC004F074, SL_E_AUTHN_MISMATCHED_KEY, The Software Licensing Service reported that the key is mismatched.”
To fix the Windows 10 Activation error 0xC004F078, you have to use the correct key for your type of Windows copy or use Command Prompt to reinstall the key or you could also try running the Activation troubleshooter.

Option 1 – Try running the Windows 10 Activation Troubleshooter

The first thing you can do to resolve the Activation error code 0xc000f074 is to run the Windows 10 Activation Troubleshooter. To do so, follow these steps:
  • Go to Settings and then select Activation.
  • After that, click on the Windows Activation and then troubleshoot. This will help you address most of the commonly found activation issues in Windows devices.
The Windows 10 Activation Troubleshooter will determine if your license key is a valid Windows 10 digital license for an edition that is not currently installed. If it turns out that it’s not, then the troubleshooter will show you how to install the correct edition.

Option 2 – Try to use the correct key for the type of Windows version you have

If the Windows Activation troubleshooter wasn’t able to resolve the error, then you can try using the correct key for your type of Windows version. All you have to do so is check the type of your Windows copy if it’s OEM, retail, or volume. And make sure that you have the correct, valid product key for your operating system.

Option 3 – Try to use Command Prompt to reinstall the key

  • In the Start Search, type “command prompt” and right-click on Command Prompt from the search results, and then select “Run as administrator”.
  • After that, execute this command to uninstall the existing key: vbs /upk
  • Next, you need to install the KMS product key by executing this command: vbs /ipk <The KMS Product Key>
  • Once you’re done, you will see a prompt that’ll tell you whether the operation was either successful or not.
  • To active, the KMS product key online, use this command: vbs /ato
  • Use this command to activate the key using the telephone: exe 4
  • After you’ve activated the KMS product key, restart the Software Protection Service. You can also verify the Activation Status to check if your fix was successful or not.

Option 4 – Contact Microsoft Support for assistance

If you’re at your wits’ end in trying to upgrade your computer, you should consider contacting Microsoft Support for help as they can offer you various options that would make fixing Windows Activation error code 0xc000f074 a lot easier and faster.
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Windows S mode

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Windows Defender

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Microsoft Account

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Ransomware protection

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Conclusion

As we went through Windows 11 security features, we can clearly see that it is packed heavily with many security features that aim to protect your data and your identity. Looking at them, one can clearly come to the conclusion that you do not really need any third-party software and that Windows itself can catch and protect most of the issues, and they would be right. If you use Windows 11 carefully, meaning that you go only to trusted websites, do not open suspicious emails, and click on suspicious links, if you do not use extensively external USB devices or mass media you really do not need any kind of third party protection, Windows built-in tools will do well and keep you protected. However, if you do come in contact with other people's USB devices if you surf over the net, and overall if you really want to be at peace of mind that you are protected you will still need a well-established third-party software protection solution. Windows 11 has great security features, best so far in any Windows but it is still far from being a solution that does not require dedicated protection solution. So do yourself a favor and grab one. We recently had a top antivirus software review, find the article here and pick one that is best for you. https://errortools.com/viruses/the-best-antivirus-software-of-2021/
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A Guide to Fixing Corefoundation.dll Error on Your PC

Corefoundation.dll Error - What is it?

Corefoundation.dll error is a DLL error code associated with Apple software such as iTunes, MobileMe, QuickTime and etc. To understand this error better, first you need to understand what corefoundation.dll file is. Corefoundation.dll is a Dynamic Link Library file that is used by Apple software products. This file is created by Apple computer Inc and is designed to help open up some of the media files that you might have on your PC. DLLs help promote modularization of code, efficient memory usage, code reuse and reduced disk space allowing the operating system and the programs to load and run faster and take less disk space on the computer.

Error Messages

This error pops on the screen when there is an issue related to Apple software products on your system. Corefoundation.dll error is displayed on the computer screen in any one of the following formats:
“The program can not start because corefoundation.dll is missing from your computer. Try reinstalling the program to fix this problem”. "This application has failed to start because CoreFoundation.dll was not found. Re-installing the application may fix this problem." “The procedure entry point_CFBundleCopyFileTypeForFileData could not be located in the dynamic link library corefoundation.dll.” "MobileMe Control Panel cannot continue as Apple Application Support is missing or outdated. Please uninstall and reinstall the latest version of iTunes and MobileMe Control Panel to fix this issue.”
Though this error code is not fatal but if it is not fixed immediately it will hamper your ability to load and run Apple programs on your system.

Solution

Restoro box imageError Causes

Corefoundation.dll error can be triggered due to several reasons. Here are some of the most common corefoundation.dll error causes:
  • Outdated PC drivers
  • Viral infection
  • Damaged Windows registry files
  • Corrupted corefoundation.dll file
  • Missing corefoundation.dll file
  • Incorrectly installed third-party software

Further Information and Manual Repair

To fix this issue on your computer here are some of the best, easy and quick do it yourself methods that you can try:

Method 1: Download the Original Corefoundation.dll File

If the underlying reason for corefoundation.dll error is file corruption or it goes missing, then the best way to resolve is to download the original corefoundation.dll file. Once you download it, paste it to its exact location. DLL files are normally located in the following location C:\Windows\System32. Once you paste it, register the file by typing ‘regsvr corefoundation.dll’ at the command prompt. When the process is complete, restart your PC to activate changes. Alternatively, you can uninstall and re-install any Apple Software you may have on your Windows Computer. To do that, Open the Control Panel, navigate to "Install/Uninstall a Program", search for Apple software, and uninstall them.

Method 2: Update Window Drivers

If the error code is related to outdated drivers, then it is recommended that you update them promptly to resolve the corefoundation.dll error on your PC. This can be done by using a driver update wizard from within Device Manager. The driver update wizard walks you through the entire drive update process, making updating a hassle-free process.

Method 3: Download Restoro

If the error still persists, then try method 3. Sometimes the cause of corefoundation.dll can be viral infection or registry issues.  Viruses may enter your PC unknowingly through phishing emails and downloads which can corrupt and damage your dll files. Also, if you don’t clean your registry frequently, unnecessary and obsolete files may accumulate in the registry like cookies, junk files, internet history and temporary files. These files take up a lot of disk space corrupt DLL files and lead to disk fragmentation. Regardless of what the issue is, Restoro is your one-stop PC Fixer. It is a multi-functional and user-friendly repair tool embedded with 6 different scanners including a registry cleaner and an antivirus. It scans and removes all types of viruses and cleans and restores the registry too. Click here to download Restoro and resolve the corefoundation.dll error today!
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How to Fix Error Code 0x80073b01

Error Code 0x80073b01 - What is it?

The 0x80073b01 is an error message that often pops up on the screen when you run Windows Defender. Windows Defender is an antispyware by Microsoft integrated into Windows Vista and Windows 7. The error code 0x80073b01 is considered to be a critical Windows error which must be fixed immediately. This error code locks you out of Windows Defender thus putting your computer at risk potential security loopholes in the Windows environment such as notorious software like spyware, adware, and viruses. This is dangerous especially if you have confidential data saved on your PC as it can be exploited easily if you don’t remove such malicious software the right way. This can lead to data breaches, cybercrime, and the worst-case scenario can be identity theft. Error code 0x80073b01 symptoms include:
  • Sluggish pc performance,
  • Problems during software installations
  • Beeping sounds
  • Unexpected shutdowns
  • Screen freeze

Solution

Restoro box imageError Causes

The error code 0x80073b01 occurs when Windows Defender gets damaged due to misconfigured files and registry corruption. It is advisable to fix this error right away to avoid serious damages.

How to Resolve the Error Code 0x80073b01?

To repair the error code 0x80073b01 on your PC you don’t necessarily have to call a professional; you can fix it on your own with the help of Restoro. It’s very easy to use and does not require you to be technically sound. Besides, it can be downloaded for free thus helping you save hundreds of dollars that you are likely to spend on hiring a technician for the error code repair job. Restoro is the latest and a multi-functional system optimizer and a repair tool. This software is integrated with highly functional features that enable you to resolve almost all types of PC-related errors including the error code 0x80073b01. It includes powerful and value-adding features like registry cleaner, system stability detector, privacy error finder with anti-virus properties, and Active X and Class issues detector. With the help of its ‘registry cleaner’, you can easily scan for 0x80073b01 error codes on your PC. It offers in-depth registry cleaning scanning all the underlying causes of registry corruption that triggers 0x80073b01 error. The underlying cause for registry corruption is the accumulation of unnecessary and malicious files in the registry like junk files, temporary internet files, and invalid entries. Restoro with the help of its registry cleaning utility clears the clutter in seconds, frees up your disk space, and repairs the registry. And since the error 0x80073b01 hampered your ability to scan for viruses and spyware with Windows Defender, your computer may be exposed to serious data security threats by such malware. However, with Restoro you can remove malware from your system too. Restoro also functions as a powerful anti-virus. With the help of its privacy error detector, it scans for malicious viruses, adware and spyware on your PC ensuring that you are safe and protected from data breaches and cybercrime. This tool resolves the error 0x80073b01 successfully while repairing your registry and simultaneously optimizing the speed of your PC. It has a user-friendly interface and a simple design. There is absolutely nothing complex about it. All you have to do is download and install Restoro on your system and run it to scan for errors. After the scanning is complete, you will see a comprehensive and detailed error report specifying the number and the types of errors your PC is inflicted with. Now all you have to do is click on the Repair button to fix the issues on your PC including the error 0x80073b01 right away. Restoro is a safe and efficient tool that helps you resolve PC issues in seconds. For optimum results, it is advisable to run it on your PC regularly. This will help you keep the registry clean, PC error-free, reduce boot time, and ensure speedy PC performance. Click here to download Restoro on your PC today!
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Fix The backup application could not start
Windows comes with a built-in backup solution. However, if it failed because of an internal error, you will encounter an error message saying, “The backup application could not start due to an internal error, Server execution failed (0x80080005)”. When you get this kind of error, it means that it did not start and the process failed with a Server execution error. If you got this kind of error worries not for this post will guide you in fixing the problem in your Windows 10 computer. The Windows Backup service is an excellent feature in Windows that only works on the NTFS file system and if you want to use this make sure that you have formatted your files system to NTFS. It is performed by the Volume Shadow Copy, all you have to do is right-click on any folder and if you see the “Previous versions” option, this means that a backup process runs from time to time and can bring back old files when needed. To resolve the “The backup application could not start due to an internal error”, here are two suggestions you can check out.

Option 1 – Check if the Volume Shadow Copy service is running and restart it

The first thing you need to do is check if the Volume Shadow Copy service. To do that, refer to the following steps:
  • Click on Start and type “cmd” and right-click on Command Prompt from the search results.
  • Then select the “Run as administrator” option to open Command Prompt with admin privileges.
  • After that, type “net stop sdrsvc” and hit Enter to execute the command in stopping the Volume Shadow Copy service.
  • Next, type the “net start sdrsvc” command and hit Enter to start the service again.
Note: You can also restart the service using the Windows Services Manager.
  • In the Cortana search box, type “services” and click on the Services icon to open the Services Manager. Alternatively, you can also tap the Win + R keys to launch the Run prompt and then type “services.msc” in the field and hit Enter to open the Services Manager.
  • From there, look for the Volume Shadow Service (sdrsv) from the list of services. Its Startup type should be set to Manual by default.
  • Restart the service and if you don’t encounter any error while you turn it on, re-run the backup service and see if the backup process runs successfully.

Option 2 – Try to run the Volume Shadow Copy Service in a Clean Boot State

If the first option didn’t work and the service still keeps on failing even though the service is running, you can try putting your computer in a Clean Boot State and then try to run Windows Backup again.
  • Log onto your PC as an administrator.
  • Type in MSConfig in the Start Search to open the System Configuration utility.
  • From there, go to the General tab and click “Selective startup”.
  • Clear the “Load Startup items” check box and make sure that the “Load System Services” and “Use Original boot configuration” options are checked.
  • Next, click the Services tab and select the “Hide All Microsoft Services” check box.
  • Click Disable all.
  • Click on Apply/OK and restart your PC. (This will put your PC into a Clean Boot State. And configure Windows to use the usual startup, just simply undo the changes.)
  • Now try to run the Volume Shadow Copy service again and see if the process goes smoothly.
Note: You might also want to delete all the files in the backup solution if you want to start fresh with the backup solution. Just go to C:/System/Volume/Information/Windows Backup and take ownership of the folder. After that, make sure to stop the Volume Shadow Copy service and then delete all the files inside it.
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