Microsoft Windows Latest Update Causes Blue Screens With 0xc000021a Errors

Microsoft is investigating a known problem that causes Blue Screen of Death (BSOD) crashes that result in 0xc000021a errors. This issue was discovered after Microsoft installed the Windows 10 KB5021233 cumulative updates during this month’s Patch Tuesday.

Over the weekend, the company advised that some Windows devices could experience an error (0xc000021a) with a blue screen.

This problem is likely due to a mismatch in the file versions of Hidparse.sys in System32 and system32/drivers within the Windows folder. “which might cause signature validation to fail when cleanup occurs.” Only client Windows 10 versions are affected, ranging from Windows 10 20H2 to Windows 10 22H2.

Redmond said that the company is already working on a solution to this issue but has yet to reveal when it will be available.

The company offered a temporary solution allowing the blue screen to be fixed and the systems to restart as normal. Users must copy the hidparse.sys.txt file from the system32drivers directory into system32 using the Windows Recovery Environment. (WinRE). This will ensure that signature validation is successful during cleanup.

How to Fix a Blue Screen of Death Error In Windows 10?

To mitigate this issue on impacted devices, you need to go through the following steps:

a. You will need to enter Windows Recovery Environment. If your device has not automatically started up into WinRE, please see Entry points into WinRE.

b. Select the Troubleshoot button.

c. Select the “Start recovery, troubleshooting, and diagnostic tools” button.

d. Select the “Advanced Options” button.

e. Select the “Command Prompt” button and wait for your device to restart, if needed.

f. Your device should restart to a Command Prompt window. You might need to sign into your device with your password before getting to the Command Prompt window.

g. Run the following command (Important: If Windows is not installed to C:\windows you will need to modify the command to your environment): xcopy C:\windows\system32\drivers\hidparse.sys C:\windows\system32\hidparse.sys

h. Once the previous command completes, type: exit
Select the “Continue” button.

i. Windows should now start up as expected.

It is not advised to use any other solution than the ones listed above. Microsoft stated that they do not recommend deleting hidparse.sys files from WindowsSystem32.

Redmond is also investigating an issue that could be linked to the Windows Server Patch Tuesday update this month. This causes errors when creating virtual machines on Hyper-V hosts.

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