‘Reboot Your PC’—Microsoft Changes ‘Most Windows Devices’ In June

Updated on May 18 with new detail about the new folder Microsoft has quietly added to your all Windows PCs, and the scripts it contains.

In an “important” update last week, Microsoft confirmed that the Secure Boot certificate expiration that starts in June will affect “most Windows devices.” To avoid disruption, the company says “take action to update certificates in advance.”

Affected PC owners are told a”new ‘SecureBoot’ folder created by Windows 11’s May 2026 Update is expected behavior for Secure Boot certificates update and not a known issue.”Per Windows Latest, you don’t need to delete it, but you do need to “reboot your PC once or twice to finish applying the changes.”

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Microsoft says failing to install the latest Windows update, which should refresh your Secure Boot certificates, “might affect the ability of certain personal and…