Microsoft released the KB5062553 update for Windows, which caused boot failures in some Generation 2 Azure Virtual Machines (VMs) with Trusted Launch disabled. In response, Microsoft issued an emergency patch, KB5064489, applicable to Windows 11 and Windows Server 2025, to address these issues. Affected VMs may experience boot failures if Virtualization-Based Security (VBS) is enforced via registry key. Users are advised to check if their VMs are created as “Standard” and if VBS is enabled. The KB5064489 update is not automatically deployed and must be manually downloaded from the Microsoft Update Catalog, with specific installation methods outlined.