A bug related to the **Secure Boot** certificate update is causing some Windows computers to crash a few minutes after startup. The issue has been present since the beginning of 2026 and is linked to an automatic script that checks if the Secure Boot feature is up to date. This script, known as the "Secure-Boot-Update" scheduled task, appears to be the cause of the crashes. Users have reported that their PCs freeze or crash between three and five minutes after startup. To determine if this is the issue, users can check if the problem occurs when the PC is not connected to the Internet. If the system runs without crashing, it is likely that the Secure Boot update is the cause. Alternatively, users can manually run the "Secure-Boot-Update" task through the Task Scheduler by navigating to the Microsoft\Windows\PI menu and selecting "Run." If the PC crashes after this action, it confirms the issue is related to the Secure Boot update. Secure Boot is a security feature that verifies the authenticity of the operating system and prevents malicious software from being installed at the firmware level. The Secure Boot certificate was updated in June 2026, and the update process has caused complications for some users. This certificate is a digital key used to validate the operating system's authenticity during startup. To check if the Secure Boot certificate is up to date, users can run a PowerShell command: ([System.Text.Encoding]::ASCII.GetString((Get-SecureBootUEFI db).bytes) -match 'Windows UEFI CA 2023'). If the result is "True," the certificate is up to date, and the "Secure-Boot-Update" task can be safely disabled to prevent crashes. If the result is "False," users should refer to Microsoft's list of possible solutions to resolve the issue. Microsoft has not yet provided a specific fix for the bug, and users are advised to follow updates from the company for a potential resolution. The company is likely working on a patch, but in the meantime, users can take steps to avoid crashes by either disabling the task or ensuring their certificates are updated.