Error 0xc000021a: Blue Screen of Death in Windows

Error 0xc000021a (also known as STATUS_SYSTEM_PROCESS_TERMINATED) is one of the most critical errors in the Windows operating system. It causes the so-called "blue screen of death" (Blue Screen of Death, BSOD) and indicates serious malfunctions in the system's operation.

Causes of Error 0xc000021a

This error occurs when one of the critically important system processes unexpectedly terminates. It is most often associated with the following factors:

• Problematic Windows updates — installation of incorrect or conflicting updates;
• Corruption of system files — violation of the integrity of important OS components;
• Driver conflicts — incompatibility or errors in device drivers;
• Hardware failures — issues with RAM or hard drive;
• Malware — actions of viruses that damage system files;
• Improper shutdown — sudden power loss to the computer.

Symptoms of the Error

When the error 0xc000021a occurs, users observe the following symptoms:

1. A blue screen with an error message and code 0xc000021a;
2. Automatic reboot of the computer;
3. Inability to boot the operating system in normal mode;
4. System freezing or cyclic rebooting.

Methods to Resolve the Issue

Method 1: Using System Restore

If Windows boots, follow these steps:

1. Press Win + R and type sysdm.cpl;
2. Go to the System Protection tab;
3. Click the System Restore button;
4. Choose a restore point created before the error occurred;
5. Follow the instructions of the restoration wizard.

Method 2: Uninstalling Recent Updates

Boot into safe mode and uninstall problematic updates:

1. Open Settings → Update & Security;
2. Go to the Windows Update section;
3. Click View update history;
4. Uninstall recently installed updates.

Method 3: Checking and Restoring System Files

Open the command prompt as an administrator and execute:

sfc /scannow

After the scan is complete, run:

DISM /Online /Cleanup-Image /RestoreHealth

Method 4: Checking RAM

The error may be caused by defects in RAM. To diagnose:

1. Create a bootable USB drive with MemTest86;
2. Boot from it and run the memory test;
3. Leave the computer for several hours for a complete test.

Method 5: Clean Boot of the System

1. Type msconfig in the search and open System Configuration;
2. On the General tab, select "Selective startup";
3. Uncheck "Load startup items";
4. On the Services tab, check "Hide all Microsoft services";
5. Click "Disable all" and restart the computer.

Prevention of Error 0xc000021a

To avoid the recurrence of the error, follow these recommendations:

• Regularly update the system — install updates in a timely manner;
• Create restore points — before installing major updates;
• Use reliable antivirus — regularly scan the system;
• Update drivers — use only official sources;
• Make backups — save important data to external storage.

Conclusion

Error 0xc000021a is a serious system failure, but in most cases, it can be fixed without reinstalling Windows. It is important to act systematically and not panic when the blue screen appears. Follow our instructions, and you will be able to restore your computer's functionality.

If none of the methods helped, it is recommended to consult a specialist or consider reinstalling the operating system.