How to Repair BSOD Stop Error code 0xc000021a in Windows 10

Error code 0xc000021a - What is it?

Error code 0xc000021a occurs when the system is unable to start or there’s a failure in critical system processes. Normally, it would take about several seconds for the system to boot and while on the startup process, error code 0xc000021a may take place to block the system to boot up. Users will get a blue screen of death (BOSD) when this error occurs. When upgrading to Windows 10, be careful; you might encounter other error messages such as error code 8007002c

Solution

Restoro box imageError Causes

There are several reasons why error code 0xc000021a occurs. It is important to have a full understanding of what caused the blue screen of death before attempting to fix the error by yourself. See below for a few common causes:

Computer malware has infiltrated your device.

• Important files such as Winlogon.exe and Csrss.exe are damaged. Winlogon.exe file is responsible for handling the login and logout processes while Csrss.exe is a vital part of Microsoft Client or Server ‘Runtime Server Subsystem’. Once one of these files is damaged or deleted, a stop error will occur.

• When there are mismatched system files installed or system upgrading process failed or still incomplete.

• Premature unloading of Wbemprox.dll

• Newly installed third-party software is not compatible with the operating system.

• There are corrupted, outdated, or incorrectly configured device drivers.

• There’s insufficient space in the system partition. Once the system partition is full, certain errors such as error code 0xc000021a will manifest.

• Windows registry is corrupted or damaged due to a software or system change. This means there are registry entries that are not cleared after uninstalling an application.

Further Information and Manual Repair

In fixing error code 0xc000021a, you might want to try and manually do so. Manual repair methods can give users effective and efficient solutions, addressing the root problems in relation to Windows error codes. Once the manual repair method is correctly implemented, users will be able to resolve issues immediately.
However, there might be instances when a Windows professional is needed. In such cases, seek help from a certified Windows expert or you might want to consider using an automated tool whenever necessary.

Method One: Convert the Drive or Partition from NTFS to GPT

In order to fix Error code 0xc000021a in Windows 10, you might need to convert the partition or drive from NTFS to GPT. See below for the procedure:
1. Shut down your device then put in the Windows installation USB key or DVD.
2. Boot your device to the USB key or DVD in UEFI mode.
3. Inside the Windows Setup, open a Command Prompt window by pressing Shift + F10.
4. Type diskpart in the Command Prompt window to open the diskpart tool.
5. Type list disk to identify which drive to reformat.
6. Select which drive to reformat by typing select disk in the command prompt. Afterward, type clean then hit

Enter. Once done, type convert gpt to be able to convert the drive from NTFS to GPT. Finally, type exit and press Enter. You can now close the Command Prompt window.
7. Once the partition or drive is converted from NTFS to GPT, the user can now continue the Windows Setup installation.
NOTE: Select Custom in choosing which installation type to use. The drive will then appear as a single area of unallocated space. Choose that unallocated space then select Next. At this point, Windows will now begin the installation.

Method Two: Fix System File Errors

There are times when system files get corrupted or damaged which will result in system failure. If this is the case, you can use a Windows free tool to repair corrupted or damaged system files.

1. Right-click on the Start button then selects Command Prompt (Admin) from the list to open a Command Prompt window.
2. Once the Command Prompt appears, type sfc /scannow then hit Enter. Wait until the process completes. If the process is completed and it doesn’t report any error or issues that remain unsolved, you might want to employ the next method.

Method Three: Reset Windows 10

Resetting Windows will delete all software and user accounts installed in the operating system and will reinstall a fresh Windows.

1. Boot your device using a Windows installation USB key or DVD. Select Repair your computer to locate the Troubleshoot option. Afterward, choose Reset this PC.
NOTE: If the device is able to boot the system, you can reset Windows without using a Windows installation USB key or DVD. You just have to boot the device then navigate to Settings in the Start button. Choose Update & Recovery then select Recovery found on the left pane. Choose Reset this PC option then select Go back to an earlier build and Advanced startup. Select Get Started button found in the Reset this PC tab.

2. Depending on your device’s condition, you can either select Keep my files or Remove everything. Both options will remove all applications installed in the device and will revert to default settings.
3. Choose either Just remove my files or Remove files and clean the drive depending on the situation. If you choose the Remove files and clean the drive option, the procedure will take longer as it will erase all the files permanently. In this case, deleted files cannot be recovered. However, if you don’t want to remove files permanently, select Just remove my files.
4. Once you’ve decided how to reset your system, click on Next once the Warning screen appears. Afterward, choose Reset once prompted. When the process completed, click on Continue.

Method Four: Download an Automated Tool

Can’t seem to put up with the long and technical manual repair process? You can still fix this error by downloading and installing a powerful automated tool that will surely get the job done in a jiffy!

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When you receive Error 0x800704C8 when trying to move a file inside Windows 10 operation is stopped and it can not continue leaving you with the file in its original location without a copy. Several issues can be the cause of this type of behavior and error and after some digging and analyzing we are bringing you various solutions for this error and how to fix it.

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Visual Studio issue

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Corrupted system files

If the previous solutions have not provided you with results then you have system file corruption that needs to be fixed. Move from one solution to another as presented below:
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    SFC scan is a built-in Windows tool for solving corrupted system file issues, it is fully automated and does not require from the user any kind of knowledge or information. To run it and scan the system do the following: Press ⊞ WINDOWS + X to open the secret menu Left-click on the command prompt (admin) In command prompt type SFC /SCANNOW and press ENTER Wait for the process to finish, do not interrupt it and once it is done, restart your computer
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Device attached to system is not functioning
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Option 1 – Try to check the status of the device

The first thing you can do to get rid of the error is to check the status of the external device, especially if it’s a plug-and-play device. So when your computer boots, check if it is able to detect the device or not.

Option 2 – Try to check the compatibility between the external devices and drivers

As you know, when you connect an external device to your computer, Windows installs drivers to communicate with the device, the same way as any hardware you connect to the motherboard and if the driver ends up getting corrupted or is incompatible, then you need to update the device driver. To do that, follow the steps below.
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  • Then click on the “Device Manager” from the search results to open it.
  • From there, look for the driver the external device related to and then right-click on each one of the Device drivers and select the Update Driver from the menu.
  • Restart your PC and then click the “Search automatically for updated driver software” option.
Note: If updating the device drivers didn’t work, you can try to reinstall them instead.

Option 3 – Try checking the hardware connections

The first thing you have to do before you further troubleshoot the problem is to check the hardware connections of your computer and see if there are damaged ones, just like with USB ports, it would also affect the overall connectivity of the device with the computer. So if you notice some irregularities in the connecting cable physically, you might have to buy another one and replace it and then see if it fixes the problem or not.

Option 4 – Check if the device is formatted properly

You might also want to check if the external device is properly formatted especially if you’ve recently formatted it. If a device wasn’t formatted properly, then it’s no wonder why you’re getting the “A device attached to the system is not functioning” error. To fix this, you need to use Disk Management. From there, you can find the devices connected but are not visible. If you are using an admin account, then to fix this error, you have the option to format the drive or create new partitions using the interface. Once you do this, it should resolve the problem.

Option 5 – Try to run System File Checker or SFC scan

  • Tap Win + R to launch Run.
  • Type in cmd in the field and tap Enter.
  • After opening Command Prompt, type in sfc /scannow and hit Enter.
  • Once done, restart your computer.

Option 6 – Restart your computer in a Clean Boot State

If a third party program like antivirus is the one that’s causing the problem, you can try to put your computer in a Clean Boot State to isolate the issue by following these steps:
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  • From there, go to the General tab and click “Selective startup”.
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  • Next, click the Services tab and select the “Hide All Microsoft Services” check box.
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  • Now try to connect your device or copy the files to your external device again and check if the error is now gone.
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Option 2 – Try to rollback, update, or disable the Graphics card drivers

Since the NMI_HARDWARE_FAILURE Blue Screen error has something to do with Graphics card drivers, you can either roll back, update or disable them depending on your preference in order to resolve the error.
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Option 4 – Try to run the Blue Screen Troubleshooter

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Saving Google Docs as a PDF

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Option 1 – Try to re-register the ntdll.dll file

You may have to re-register the ntdll.dll file using the regsvr32.exe before you can successfully install the program and fix ntdll.dll file crash error. The Regsvr32 tool is a command-line utility that can be used to register and un-register the OLE controls like DLL and ActiveX (OCX) control in the Windows operating system. Follow the steps below to use it.
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Option 2 – Disable problematic Internet Explorer add-ons

There are instances when some add-ons in the Internet Explorer browser can cause the ntdll.dll file crash error. Thus, you need to disable some add-ons in Internet Explorer and then check if it fixes the problem.

Option 3 – Try running the DISM tool

You might want to repair potentially corrupted files in your system as having them could also trigger the ntdll.dll file crash error. To repair these corrupted system files, you can run the DISM commands:
  • Tap the Win + X keys and click on the “Command Prompt (Admin)” option.
  • After that, input each one of the commands listed below sequentially to execute them:
    • Dism /Online /Cleanup-Image /CheckHealth
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  • Once you’ve executed the commands given above, restart your computer and check if the DCOM error is now fixed.

Option 4 – Try to run the Program Compatibility Troubleshooter

You might also want to run the Program Compatibility Troubleshooter. This built-in troubleshooter is available in the Windows Update & Security section. From there, select Troubleshoot. This will find a list of programs for you and since you have already downloaded the driver files, just click on Not Listed located at the top of the program list. After that, browse and select the driver files and then let the program do its job.

Option 5 – Try to replace the DLL file with a trusted source

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  • After that, you need to boot your PC into Safe Mode and navigate to the paths listed below and then replace the file using a USB drive or other external storage devices.
    • x86: This PC > C:WindowsSystem32
    • x64: This PC > C:WindowsSysWOW64
  • Next, type “cmd” in the Cortana search box and right-click on Command Prompt, and select “Run as administrator” to open it with administrator privileges.
  • Now type the “regsvr32 ntdll.dll” command and hit Enter.
  • Restart your PC and check if the error is now fixed.

Option 6 – Try scanning your computer using Windows Defender

The ntdll.dll file crash error might also be infected with malware or virus and to eliminate it, you have to scan your computer using security programs like Windows Defender.
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  • Then click on the Windows Security option and open Windows Defender Security Center.
  • Next, click on Virus & threat protection > Run a new advanced scan.
  • Now make sure that Full Scan is selected from the menu and then click the Scan Now button to get started.
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  • Your PC should be running at least the 1703 Windows 10 version or newer on an MBR partition.
Once you’ve made sure that your computer covers the aforementioned prerequisites, refer to the given options below.

Option 1 – Convert MBR to GPT via Windows built-in utilities

  • In the Windows Search box, type “command prompt” and from the search results that appear, right-click on Command Prompt and select the “Run as administrator” option.
  • After that, execute this command: exe /convert /allowfullOS
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Option 2 – Convert MBR to GPT via the Recovery Environment

  • When the message appears on your screen while running Windows Setup, you need to tap the Shift + F10 keys to open Command Prompt.
  • Make sure to run Command Prompt as admin and then execute this command: exe /convert
  • After that, wait until the process is completed. When it’s done, you have to go to the BIOS just like in the first given option above.
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Since the feature was introduced it has been set as the default option when taking pictures so each time you snap one you just capture a small amount of video and audio along. Good thing is that this feature can be turned off and the even better news is that you can edit your old photos to remove back video and audio.

How to share only photo

You can keep your Live Photos but share only a single still typical photo if you wish. Go to the photos app on your phone and select the photo you wish to share. Press the Share button on the bottom left part of the screen and once the Share menu appears tap on the Live button in the upper left corner of the selected photo. The button should turn grey and become slashed and now you can share only still photo. This is only temporary for this one specific share so next time you want to do this you will have to go through the process again.

How to disable Live Photo

If you are not happy with the previous solution and really do not want to turn off the Live feature each time you want to share a photo or you just simply do not want the feature at all there is way to turn if off for good. Take note that you can temporarily not use this feature just by opening the camera, switching to photo mode, and then tapping on the Live photo button on the toolbar that looks like three circles one inside another. This will temporarily turn the Live Photo feature for this session but next time when you open the camera by default it will be turned on again. This is a good approach if you want the feature but sometimes you just want not to use it.

In order to turn it off completely go to the settings of your phone and go to Camera and then preserve settings. inside the preserve setting turn the switch Live Photo to ON position, now go-to camera and again click on the live photo button to turn it off but this time setting will be saved and next time you open the camera it will not be ON.

Editing old Live Photos

As stated before you can edit your old pictures in order to make them stills. You can edit them to remove audio only but keep the video part, or you can completely remove everything and convert them into typical still images.

In order to only remove audio from your Live Photos go to pictures and select one that you wish to change, click on edit, and inside edit tap on the Live Photo icon (three circles). Next tap on the audio icon located in the top left corner of your screen and it will change into the mute icon. Click on done and you are finished.

To completely remove the Live photo go to Photos, select picture, click on edit and select the live photo button again. This time tap and hold the Live button next to the sound until it turns gray with a strike through it. Click on done and you are finished.

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Windows won’t go Sleep, Legacy Kernel Caller
If the display of your Windows 10 computer turns on all of a sudden no matter how put it to sleep over and over again, it always wakes up, read on as this post will guide you in resolving this peculiar issue. In case you don’t know, the Windows 10 computer Sleep state is made in such a way that if it’s really important, it wakes up. You may have configured this kind of behavior or there could be some hardware component that’s interrupting its Sleep state. Thus, this post will give you some troubleshooting tips to fix the Sleep state issue caused by the Legacy Kernel Caller. The Legacy Kernel Caller points to the external hardware that’s causing your Windows 10 to wake up even when it’s in a Sleep state. Step 1: Find out what’s keeping your computer from going to sleep. To figure out what really is keeping your computer from going to sleep, you can execute the “powercfg –requests” command instead of checking the power configuration of your computer. This command will look for requests from applications and drivers that prevent the computer from turning off the display or from going to sleep. To execute the command, simply open Command Prompt and type “powercfg –requests” and hit Enter. After that, you will see part of the result that looks like this:
“SYSTEM [DRIVER] USB AUDIO DEVICE An audio stream is currently in use [DRIVER] Legacy Kernel Caller.”
Step 2: The next thing you have to do is remove all the external hardware connected to your computer. In this step, you have to disconnect external hardware from your computer. Based on reports from users who experienced the same issue, the “TV card” is the culprit so make sure you remove that one. Once you’ve removed it, open Command Prompt and run the “powercfg –requests” command again and you’ll see that the “Legacy Kernel Caller” will no longer be on the list. In addition, your computer will get into its regular sleep mode once the hardware is removed. Once you do that, the driver gets hung and won’t release the power request despite being used. Step 3: Try using the request override option The powercfg command also offers a request override option which allows users to disable the requests from applications and services to wake the computer from sleep mode. To run this command, simply open Command Prompt with admin privileges. After you open Command Prompt, type the following command and hit Enter to disable requests from applications and services that causes the computer to wake from sleep state.
Powercfg -requestsoverride Driver "Legacy Kernel Caller" System
Step 4: Check the streaming and media applications You also have to check if your computer is running an audio or video service in the background. In such cases, your computer won’t be able to go to sleep mode if these services are running in the background. You might have noticed that when you play a video or audio, your computer never goes to sleep. And if you have put it to sleep in between watching the video, then it’s probably why your computer is waking up. Thus, you have to stop these services. Step 5: Check the devices that can wake your computer If you didn’t see the Legacy Kernel Caller in the result after you execute the ”powercfg –requests” command, then you can try to execute the following command instead.
powercfg –devicequery wake_armed
After you enter this command, it will give you a list of all the devices that can wake your computer. So if there is anything other than the mouse, keyboard, touchpad, you have to check the power configuration of that device. To do that, go to the Device Manager and disable the device’s “Allow this device to wake the computer” option in its Properties Step 6: Check the Sleep Advanced Settings
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  • Next, select the Security and Maintenance option and click on the Power Options.
  • After that, you have to select the Change Plan Settings but keep in mind that this option is barely readable so you need to read each option carefully.
  • Now click on the Change advanced power settings button and a new window will appear.
  • Then look for the “Sleep” option and expand it. Make sure that the “Allow hybrid sleep” option is on.
  • Reboot your computer and check if your computer now functions properly. If it still didn’t work, you may have to reverse the changes you’ve made.
On the other hand, you could also run the Power Troubleshooter to resolve the Sleep state issue. This built-in troubleshooter will automatically fix any power-related issues in your computer.
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How to Use and Configure Active Hours
The issue with the abrupt system reboots to force Windows 10 updates on a computer has been lessened with Active Hours. This feature keeps a record of the hours during which a system remains active and prevents the installation of updates during such hours. For example, when a system restart is needed to complete the installation of an update, Active Hours delays the update and allows you to finish what you’re doing on your computer. Thus, if you haven’t heard of this feature, then now is the time you do, read this post to configure and use Active Hours in your Windows 10 computer. There are three ways you can configure Active Hours. The first one is for general users, whereas the rest of the two methods are for users who knows their way about the Windows Registry and Group Policy. To get started, refer to every given option below.

Option 1 – Configure Active Hours via Windows 10 Settings

  • Go to Settings > Update & Security. From there, click on the “Change active hours” option under the Windows Update section.
  • Next, you can select a time (“Start time” and “End time”) during which the restart can occur.
  • After that, click on the Save button and exit.
Note: Keep in mind that the values you’ve entered indicate the hours during which your system is in use, namely, ACTIVE. It is important for your active hour’s interval period and it can be anything between 1 and 18 hours since you can’t go beyond 18 hours. In addition, there is no option to configure different active hours on different days and you can’t specify different active hours for weekends and weekdays as well. On the other hand, Windows 10 also offer users an option to override Active Hours. All you have to do is go to Settings > Update & Security > Windows Update > Restart Options. From there, you can choose a custom restart time when your computer will restart to install the updates but this is only a one-time setting.

Option 2 – Configure Active Hours via Registry Editor

  • Tap the Win + R keys to open the Run utility and type “Regedit” in the field and tap Enter or click OK to open the Registry Editor.
  • Next, navigate to this registry path: HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsUpdateUXSettings
  • In the given registry path, you can choose to change “ActiveHoursStart” and “ActiveHoursEnd”.
Note: There are no extra settings available in the Registry Editor but you can change the remote computer’s Active hours settings using the Registry Editor.

Option 3 – Configure Active Hours via Group Policy

Note that this option is available for the Windows 10 Pro and Educational or Enterprise versions. It is mostly used by computers in Business or through remote access. To get started, follow these steps:
  • Tap the Win + R keys to launch Run and type “gpedit.msc” in the field and tap Enter or click OK to open the Group Policy Editor.
  • Next, navigate to this group policy setting: Local Computer Policy > Computer Configuration > Administrative Templates > Windows Components > Windows Updates.
  • From there, look for a policy labeled “Turn off auto-restart for updates during active hours” and double click on it. This will open a new window.
  • Click on the Enabled radio button to enable Active Hours. You also have the option to choose active hours just like in the first given option above. It works just fine except when the following policies don’t override:
    • No Auto-restart with logged-on users for scheduled automatic updates installations.
    • Always automatically restart at the scheduled time.
  • Since Group Policy allows you to reduce the range of active hours, you can configure it if you want it to be less than 18 hours. Just find the policy setting labeled “Specify Active hours range for auto -restarts. The minimum is 8 hours”.
  • After you set the Active Hours, click the Apply and OK buttons to save the changes made.
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