Don’t Panic – 0x00000021 Error Code? Let’s Fix it Together!


Error code 0x00000021 is a common Windows error that can occur when attempting to boot up a computer. This error is usually caused by a corrupted or damaged system file, or a hardware issue. It can be a frustrating experience, as it can prevent you from accessing your computer. Fortunately, there are a few steps you can take to try and fix this error. In this article, we will discuss the causes of this error and provide some tips on how to fix it.

What is Error Code 0x00000021 and How Can You Fix It?

Error Code 0x00000021 is a critical system error that occurs when a system process fails. This error can cause a variety of issues, including system instability, data loss, and even system crashes. Fortunately, there are several steps you can take to fix this error and restore your system to its normal functioning.

First, you should check your system for any viruses or malware. Malware can cause this error to occur, so it is important to make sure your system is free of any malicious software. You can use a reliable antivirus program to scan your system and remove any malicious files.

Next, you should check your system for any corrupted or missing system files. This error can be caused by a missing or corrupted system file, so it is important to make sure all of your system files are intact. You can use a reliable system file checker to scan your system and repair any corrupted or missing files.

Finally, you should check your system for any hardware issues. This error can be caused by a faulty or outdated hardware component, so it is important to make sure all of your hardware is functioning properly. You can use a reliable hardware diagnostic tool to scan your system and identify any hardware issues.

By following these steps, you should be able to fix Error Code 0x00000021 and restore your system to its normal functioning.



Common Causes of Error Code 0x00000021 and How to Troubleshoot It

Error code 0x00000021 is a common issue that can occur on Windows computers. This error code is usually caused by a corrupted or damaged system file, a virus or malware infection, or a hardware issue. Fortunately, there are several steps you can take to troubleshoot this error code and get your computer back up and running.

The first step is to check for any hardware issues. If you recently installed any new hardware, such as a new hard drive or graphics card, it could be causing the error. Try removing the hardware and see if the error persists. If it does, then the hardware is likely not the cause.

The next step is to check for any virus or malware infections. Run a full system scan with your antivirus software to check for any malicious programs. If any are found, remove them and then restart your computer.

If the error persists, then it is likely caused by a corrupted or damaged system file. To fix this, you can use the System File Checker (SFC) tool. This tool will scan your system for any corrupted or damaged files and replace them with the correct versions.

Finally, if none of the above steps work, then you may need to perform a clean install of Windows. This will erase all of your data and programs, so make sure to back up any important files before proceeding.

By following these steps, you should be able to troubleshoot error code 0x00000021 and get your computer back up and running.



How to Use System Restore to Fix Error Code 0x00000021

System Restore is a powerful tool that can help you fix error code 0x00000021. It can restore your computer to a previous state, undoing any changes that may have caused the error. Here’s how to use System Restore to fix error code 0x00000021:

1. Open the Start menu and type “System Restore” into the search bar.

2. Select “Create a restore point” from the list of options.

3. Click “System Restore” and follow the on-screen instructions to select a restore point.

4. Select the restore point that is closest to the time before the error code 0x00000021 occurred.

5. Click “Next” and then “Finish” to begin the restore process.

6. Wait for the restore process to complete.

7. Restart your computer and check to see if the error code 0x00000021 has been fixed.

Using System Restore can be a great way to fix error code 0x00000021. However, it is important to remember that System Restore will undo any changes that have been made since the restore point was created. Therefore, it is important to back up any important files before using System Restore.



How to Use the Windows Memory Diagnostic Tool to Fix Error Code 0x00000021

If you are experiencing the error code 0x00000021, you may be able to fix the issue by using the Windows Memory Diagnostic Tool. This tool is designed to help identify and troubleshoot memory-related issues on your computer. Here is how to use the Windows Memory Diagnostic Tool to fix error code 0x00000021:

1. Open the Start menu and type “memory” into the search bar.

2. Select “Windows Memory Diagnostic” from the list of results.

3. Click “Restart now and check for problems (recommended)” to begin the diagnostic process.

4. Your computer will restart and the Windows Memory Diagnostic Tool will begin to scan your system for any memory-related issues.

5. Once the scan is complete, the tool will display any errors it has found.

6. If the tool finds any errors related to error code 0x00000021, it will provide instructions on how to fix them.

7. Follow the instructions provided by the tool to fix the issue.

8. Once the issue is fixed, restart your computer and check to see if the error code 0x00000021 has been resolved.

By using the Windows Memory Diagnostic Tool, you can quickly and easily identify and fix any memory-related issues that may be causing error code 0x00000021.



How to Use the SFC Command to Fix Error Code 0x00000021

The System File Checker (SFC) is a powerful tool that can be used to fix a variety of errors, including Error Code 0x00000021. This error code is typically caused by corrupted or missing system files, and the SFC command can be used to scan and repair these files. To use the SFC command to fix Error Code 0x00000021, follow these steps:

1. Open the Command Prompt. To do this, press the Windows key + R, type “cmd” into the Run box, and press Enter.

2. Type “sfc /scannow” into the Command Prompt window and press Enter. This will initiate a scan of your system files.

3. Wait for the scan to complete. This may take several minutes.

4. Once the scan is complete, the SFC command will attempt to repair any corrupted or missing system files.

5. Restart your computer.

By following these steps, you should be able to use the SFC command to fix Error Code 0x00000021. If the error persists, you may need to contact a professional for further assistance.



How to Use the DISM Command to Fix Error Code 0x00000021

If you are experiencing the error code 0x00000021, you can use the Deployment Image Servicing and Management (DISM) command to help you fix the issue. DISM is a command-line tool that can be used to repair corrupted system files and to repair and prepare Windows images, including the Windows Recovery Environment, Windows Setup, and Windows PE.

To use the DISM command to fix error code 0x00000021, you will need to open an elevated command prompt. To do this, press the Windows key + X and select Command Prompt (Admin). Once the command prompt is open, type the following command and press Enter:

DISM.exe /Online /Cleanup-image /Restorehealth

This command will scan the system for any corrupted files and attempt to repair them. Once the scan is complete, restart your computer and check to see if the error code 0x00000021 has been resolved.

If the error persists, you may need to use the System File Checker (SFC) tool to repair any corrupted system files. To do this, open an elevated command prompt and type the following command and press Enter:

SFC /scannow

This command will scan the system for any corrupted files and attempt to repair them. Once the scan is complete, restart your computer and check to see if the error code 0x00000021 has been resolved.

Using the DISM command and the System File Checker tool can help you fix error code 0x00000021. If the issue persists, you may need to contact Microsoft Support for further assistance.



How to Use the CHKDSK Command to Fix Error Code 0x00000021

The CHKDSK command is a powerful tool that can help you fix error code 0x00000021. This error code is usually caused by a corrupted or damaged file system, and the CHKDSK command can help you repair it. Here are the steps to use the CHKDSK command to fix error code 0x00000021:

1. Open the Command Prompt. To do this, press the Windows key + R, type “cmd” and press Enter.

2. Type “chkdsk /f” and press Enter. This will start the CHKDSK command and scan your computer for errors.

3. Wait for the scan to finish. This may take a few minutes, depending on the size of your hard drive.

4. Once the scan is complete, type “exit” and press Enter to close the Command Prompt.

5. Restart your computer. This will apply the changes made by the CHKDSK command and hopefully fix the error code 0x00000021.

Using the CHKDSK command is a simple and effective way to fix error code 0x00000021. However, if the error persists, you may need to contact a professional for further assistance.



How to Use the Driver Verifier Tool to Fix Error Code 0x00000021

The Driver Verifier Tool is a powerful tool that can help you fix error code 0x00000021. This error code is caused by a driver that is not functioning properly, and the Driver Verifier Tool can help you identify and fix the problem. Here is how to use the Driver Verifier Tool to fix error code 0x00000021:

1. Open the Start menu and type “verifier” into the search bar. Select the “Create Standard Settings” option.

2. Select the “Create Custom Settings” option and select the “Select Drivers from a List” option.

3. Select the drivers that you want to verify and click “Next”.

4. Select the “Select individual settings from a full list” option and select the “Force Pending I/O Requests” option.

5. Click “Next” and then click “Finish”.

6. Restart your computer and the Driver Verifier Tool will begin to run.

7. Once the Driver Verifier Tool has finished running, it will display any errors that it has found.

8. If the Driver Verifier Tool has identified a driver that is causing the error code 0x00000021, you can then update or uninstall the driver to fix the problem.

By following these steps, you can use the Driver Verifier Tool to fix error code 0x00000021. This powerful tool can help you identify and fix driver-related issues quickly and easily.



How to Use the System File Checker Tool to Fix Error Code 0x00000021

The System File Checker (SFC) tool is a powerful tool that can help you fix error code 0x00000021. This error code is usually caused by corrupted or missing system files. The SFC tool can help you identify and repair these files, allowing you to get your system back up and running. Here’s how to use the SFC tool to fix error code 0x00000021:

1. Open the Command Prompt. To do this, press the Windows key + R, type “cmd” into the Run box, and press Enter.

2. In the Command Prompt window, type “sfc /scannow” and press Enter. This will initiate a scan of your system files.

3. The scan may take several minutes to complete. Once it is finished, the SFC tool will report any corrupted or missing system files it has found.

4. If the SFC tool finds any corrupted or missing system files, it will attempt to repair them. If it is unable to repair them, it will prompt you to insert your Windows installation disc.

5. Insert your Windows installation disc and follow the on-screen instructions to repair the corrupted or missing system files.

6. Once the repair process is complete, restart your computer and check to see if the error code 0x00000021 has been resolved.

By following these steps, you should be able to use the SFC tool to fix error code 0x00000021. If the error persists, you may need to contact Microsoft Support for further assistance.



How to Use the Windows Update Troubleshooter to Fix Error Code 0x00000021

If you are experiencing error code 0x00000021 on your Windows computer, the Windows Update Troubleshooter can help you resolve the issue. This troubleshooter is designed to detect and fix common problems with Windows Update, including error code 0x00000021. Here is how to use the Windows Update Troubleshooter to fix this error:

1. Open the Settings app on your Windows computer.

2. Select the “Update & Security” option.

3. Select the “Troubleshoot” option from the left-hand menu.

4. Select the “Windows Update” option from the list of troubleshooters.

5. Click the “Run the Troubleshooter” button.

6. Follow the on-screen instructions to complete the troubleshooting process.

7. Once the troubleshooting process is complete, restart your computer and check if the error code 0x00000021 has been resolved.

By following these steps, you should be able to use the Windows Update Troubleshooter to fix error code 0x00000021. If the issue persists, you may need to contact Microsoft Support for further assistance.



Error code 0x00000021 is a common error that can occur when a computer is trying to boot up. It is usually caused by a corrupted or missing system file, or a hardware issue. Fortunately, it is usually easy to fix with a few simple steps. By running a system scan, updating drivers, and performing a few other troubleshooting steps, you can usually resolve the issue and get your computer back up and running.

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