Patchday update causes blue screen on Windows 10 • The register

Some Windows 10 users who installed cumulative update KB5021233 this month may see their operating system crash with the blue screen of death, Microsoft warns.

In an entry on its Windows Health Dashboard over the weekend, the company wrote that the update “could cause a discrepancy between the file versions of hidparse.sys in c:/windows/system32 and c:/windows/system32/drivers (assuming that Windows is installed on your C: drive), which can cause signature validation to fail when a clean occurs.”

The result is that the system boots to the blue screen (BSOD) with an error – 0xc000021a.

The issue affects multiple versions of Windows 10 including 22H2, 21H2, 21H1, and 20H2.

Microsoft wrote that engineers are working on a solution to the problem and in the meantime have developed a workaround using Windows Recovery Environment (WinRE), a tool for fixing operating system problems that won’t boot:

The user must enter WinRE. If the device does not automatically boot into WinRE, the steps to get there are here.

Select the Troubleshoot button.

Select the Launch Recovery, Troubleshooting, and Diagnostics Tools button.

Select the “Advanced Options” button.

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

The device should restart with a command prompt window. Users may need to sign in to their device with their password before they get to the command prompt window.

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

After the previous command completes, type: exit

Select the Next button.

Windows should now start as expected.

Microsoft also warned users against following other workarounds or deleting the hidparse.sys file from their Windows\System32 folder.

KB5021233 was released on December 13th as part of the larger Patchday rollout. According to Microsoft, the update aimed to fix an issue with the camera app that caused it to become unresponsive when running out of memory.

This is by no means the first time Microsoft has had to fix an issue caused by a Patch Tuesday update. On the same day the updates were released, the giant software maker said it was investigating issues for some Windows Server 2019 and 2022 users who were trying to spin up new virtual machines in some Hyper-V hosts.

The issue occurred after installing two updates on Windows Server or Azure Stack HCI hosts managed by System Virtual Machine Manager (SCVMM) and in SDN-enabled environments (Software-Defined Networking) with a network controller. As with the Windows 10 issues, Microsoft released a workaround while working on a fix. ®

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