Computer Error 0xc000021a

Computer Error 0xc000021a

Computer Error 0xc000021a


What is Computer Error 0xc000021a ?

The error code 0xc000021a occurs when the system fails to start or if critical system processes fail. Normally, the system takes about a few seconds to start and during the boot process, error code 0xc000021a may occur to block the system. The error 0xc000021a is a blue screen error (BSOD) that occurs randomly on your PC. It indicates that “Your PC has encountered a problem and needs to restart”. It is possible that even after a reboot, you can not access your PC.Specifically, the window error appears while Windows processes can not work properly, such as Winlogon.exe and Csrss.exe that no longer work. Therefore, the system kernel detects this and raises the BSOD problem. Winlogon is responsible for managing the login and logout processes. The Client Server-Run Time subsystem belongs to Microsoft Client or Server. If both of these files are damaged, you receive the following error message:

Computer Error 0xc000021a

Reason for Windows 10 Blue Screen Error 0xc000021a

  1. The computer contained corrupted incompatible system files.
  2. An upgrade failed.
  3. Incomplete installation of software.
  4. Incompatible device drivers.
  5. The installed third-party software file is missing.
  6. The system registry is damaged. (This may be due to disk read / write errors, power outages, or virus attacks.)

Methods to solve Computer Error 0xc000021a

Method 1: Run Startup / Auto Repair

  1. Insert the bootable Windows 10 installation DVD and reboot your PC.
  2. When prompted to press a key to boot from a CD or DVD, press any key to continue.Computer Error 0xc000021a
  3. Select your language preferences and click Next. Click Repair your computer at the bottom left.
  4. If you choose an option, click Troubleshooting.Computer Error 0xc000021a
  5. On the Troubleshooting screen, click the Advanced option.
  6. On the Advanced Options screen, click Auto Repair or Startup Repair.
  7. Wait for the end of Windows auto repair / startup.
  8. Restart and you have successfully fixed the BSOD error 0xc000021a in Windows 10,

Method 2: Correct system file errors

Sometimes, system files are corrupted or damaged, resulting in system failure. If this is the case, you can use a free Windows tool to repair corrupted or damaged system files.

  1. Right-click the Start button and select Command Prompt (Admin) from the list to open a Command Prompt window.
  2. After the command prompt appears, type sfc / scannow and press Enter. Wait until the end of the process.

If the process is complete and there are no errors, or if problems are not resolved, you may want to use the following method.

  1. Click Advanced Options -> Startup Settings.
  2. On the Startup Settings screen, click the Restart button.
  3. Allow safe mode with networking

If you are unable to display the Auto Repair screen, use the following instructions:

  1. Start your desktop or laptop using the Windows 8 or 8.1 bootable CD / DVD / USB.
  2. Then click on the button labeled next
  3. Click on the link titled Repair your computer.
  4. Click Troubleshooting> Advanced Options> Command Prompt.
  5. Type: bcdedit / set {default} bootmenupolicy legacy in the Windows command prompt and press the Enter key.
  6. Next, use a CD / DVD / USB and reboot your computer.
  7. When the PC restarts, hold down the F8 key all the time to open the Advanced Boot Options screen.
  8. Choose safe mode

Method 3: Restoring Windows Updates to Fix Error 0xc000021A

This error can also occur when the user turns off a computer or laptop while applying updates. Follow the steps below to restore the failed Windows update:

  1. Insert the installation / USB DVD or recovery disc in Windows 8 / 8.1.
  2. Restart your PC or laptop Click the Next button
  3. Next, click on the Repair your computer link.
  4. Click Troubleshooting> Advanced Options> Command Prompt.
  5. In Command exe / image prompt type: C: \ / image-clean / cancel pending actions (here, C is the system drive of your computer)