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BSOD Error Code 0xc000021a

This error appears when a user-mode subsystem, such as WinLogon or the Client Web Server Run-Time Subsystem (CSRSS), has actually been fatally jeopardized and security can no more be guaranteed. In reaction, the operating system switches over to kernel mode. Microsoft Windows could not run without WinLogon or CSRSS. Therefore, this is among minority cases where the failure of a user-mode service could turn off the system.

Mismatched system files can likewise trigger this error. This can happen if you have restored your hard drive from a back-up. Some back-up programs may avoid restoring system files that they determine are in usage. The 0xC000021A error is a Blue Screen of Death or BSOD error that appears when a Windows user-mode subsystem is compromised.

The error message that could show up on your screen is usually this:

STOP: c000021a {Fatal System Error}

The Windows SubSystem system process terminated unexpectedly with a status of 0xc0000005.

The system has been shut down.

Fixing Error

Method 1: Make Sure Your PC Drivers Are Updated (DO THIS FIRST!)

Missing or corrupt drivers are accountable for lots of bluescreen errors. Before taking the steps listed below, we suggest you carry out a free driver check with DriverFinder and see to it all your vehicle drivers are updated.

Method 2: Boot into Last Known Good Configuration

  • Restart the computer.
  • Wait for the computer to complete the POST process (system information appearing on your screen).
  • Quickly press the F8 key repeatedly until you see a list of boot options available.
  • Choose Last Known Good Configuration (your most recent settings that worked).
  • Press Enter
  • Wait for your computer boot into this mode.

Method 3: Run System Restore

  • Restart the computer
  • Press and F8 key to boot into Windows Advanced Options Menu
  • Using the arrow keys, select Safe mode with Command Prompt
  • Hit Enter
  • Login as Administrator
  • When Command Prompt Appears, type the following command and press Enter:


Method 4: Test or Swap Out Your memory (RAM)

Bad or defective RAM is known to trigger numerous bluescreen errors and can generally be replaced for low-cost. Before exchanging it out, run Memtest86+ to test OVERNIGHT to see if it reports any type of errors. If you are not comfortable opening your computer and switching out your memory, bring your computer to a certified technician.

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