Methods to Fix STOP Error 0xc000021A in Windows 8.1

Error 0xc000021A in Windows 8.1Is your PC or laptop suffering from blue screen error with the error code 0xc000021A? If yes then you are at right place, here you will read about the different methods to get rid of this issue.    

Reasons behind this problem:

System display 0xc000021A Error with blue screen only when the files Winlogon.exe or Csrss.exe are gets damaged due to any internal or external problem. These both files are one of the important system files, Winlogon.exe is responsible for managing the login and logout processes. Csrss.exe belongs to Microsoft Client or Server ‘Runtime Server Subsystem’.

There are lots of other things that can generate such type of error:

  • Due to Incompatible System files
  • Incompatible device drivers
  • Installed third-party software’s file is missing

Below some methods are given that can fix the Error 0xc000021A problem:

Clean Boot in Safe Mode

If you are unable to boot your system properly, then it will ultimately start displaying Automatic Repair screen when you try to start your PC.

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  1. Click on the Advanced options -> Startup Settingsw1
  1. On the Startup Settingsscreen, click on the Restart button
  2. Allow Safe Mode with Networking

If you are unable to see the Automatic Repair screen then apply the following instructions:

  1. Boot your computer or laptop with the help of bootable Windows 8 or 8.1 CD/DVD/USB
  2. After it click on the button labeledNext
  3. Click the link labeledRepair your computer
  4. ClickTroubleshoot > Advanced options > Command Prompt
  5. Type: bcdedit /set {default} bootmenupolicy legacy in the command prompt Windows and hit Enter key.
  6. After it, use CD/DVD/USB and reboot your computer.
    1. When the PC restarts, keep pressing F8 key continually to open Advanced Boot Options screenw2
  7. Choose Safe Mode

Once your PC start in Safe Mode without any error, then go with the below given procedure:

Try to Disable Windows Services

  1. Press Windows Key + R > type msconfig > press Enter (or click OK)w3
  2. Go to the Services tab
  3. Tick mark on the Hide all Microsoft services.
  4. Click on the Disable All and then Applyw4
  5. Go to the Startuptab
  6. Click Open Task Managerw5
  7. Disableall the items and close the Task Managerw6
  8. Clickon the OK, it will close the entire System Configuration

After the completion of above given steps reboot your computer. If Windows 8.1 system starts without any error then it means that any of the startup programs or services was at culprit. You can enable ones that you think are okay and again reboot the computer. Through this way you should find the main cause of this error.

How to Fix Windows 8.1 System Files

If you are unable to fix the issue by applying above given methods, then you should use this trick to verify the Windows 8.1 system files.

  1. Connect or insert Windows 8/8.1 installation DVD/USB or Recovery Disk
  2. Reboot your PC/laptop
  3. Click on the Nextbutton
  4. Click on the Repair your computerlink
  5. Go to TroubleshootAdvanced Options > Command Prompt
  6. InCommand Prompt type sfc /scannow > and hit Enter

Reverting Windows Updates to Fix Error 0xc000021A

This error may also occurs when user turns off a computer or laptop while its applying updates. Apply the below given steps to revert the failed Windows update:

  1. Insert Windows 8/8.1 installation DVD/USB or Recovery Disk
  2. Reboot your PC or Laptop Click on theNext button
  3. After it click on the Repair your computerlink
  4. ClickTroubleshoot > Advanced Options > Command Prompt
  5. InCommand Prompt type exe /image:C:\ /cleanup-image /revertpendingactions (here C is your computer’s system drive)w7
  6. After it hit Enterkey to run the command and revert the update.

Steps to Refresh Windows 8.1

  1. Insert the Windows 8/8.1 installation DVD/USB or Recovery Disk
  2. After getting the setup screen, click Next
  3. Click Repair your computer
  4. In Advanced Startupfeatures, click Troubleshoot
  5. ClickRefresh your PC

Steps to Reset Windows 8.1

If you still face the error then try to reset Windows 8/8.1. Through this you can solve the Error 0xc000021A problem.

  1. Insert the Windows 8/8.1 installation DVD/USB or Recovery Disk
  2. After getting the setup screen, clickNext
  3. Click Repair your computer
  4. In Advanced Startupoptions, click Troubleshoot
  5. Click Reset your PC

Automatic solution to fix STOP Error 0xc000021A in Windows 8.1

You can also go with an automatic solution, download Windows 8 PC Repair Tool. This application is specially designed to repair all types of issue that occurs on Windows PC. This tool is also ve
ry simple to use because of its user interface. So if you are unable to apply or go with the manual solution then use this tool and make your PC error free.

Follow 3 Simple Steps to Repair PC Instantly!

  1. Step 1 – Download & Install PC Repair Tool.
  2. Step 2 – Click “Scan” button to diagnose the PC.
  3. Step 3 – Click “Fix Errors” to the fix the issues and you are done.

(Note: This powerful tool can increase your performance by 97%)

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