Microsoft: some Windows 11 computers won't turn off

Earlier this week, Microsoft released the first updates of 2026 via Patch Tuesday for Windows 11 and Windows 10. It released version KB5073455 for Windows 11 23H2 and version KB5074109 for Windows 11 25H2/24H2.

As is often the case with Patch Tuesday updates, they come with bugs, and this month is no exception. The company has confirmed that Windows 11 23H2 PCs are unable to shut down properly after installing the latest build KB5073455. Fortunately, not all devices are affected by this bug, as Microsoft says that the issue is found on systems configured with Secure Launch. So if a user chooses to shut down their PC, the system will restart.

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If you're wondering what Windows Secure Launch is, first released in Windows 10, it's a virtualization-based security service (VBS) that uses hardware-based Dynamic Root of Trust for Measurement (DRTM) to protect system integrity during boot.

Secure Launch allows the system to initially boot into untrusted code, but quickly switches all CPUs to a trusted state to verify that the untrusted code is not malicious. This is to protect against firmware-level threats and works in conjunction with Secure Boot. Microsoft refers to these systems as Secured-core PCs.

The company has provided a temporary solution for the shutdown issue and states:

“To shut down your device, type cmd in the search bar and select cmd from the search results to open a Command Prompt. In the Command Prompt window, type the following command and press Enter:

shutdown / s / t 0

The problem affects hibernation, as there are some systems that cannot enter hibernation mode.

Microsoft says there is currently no fix for this. The company says it is investigating the issue and encourages users to carefully save their work before their system's battery dies.

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