![]() ![]() If you installed Windows 10/8 on a MBR disk, it also cannot boot in UEFI mode. If you configure a UEFI system to boot in Legacy mode, you’ll get the error message that saying operating system is missing or not found. The operating system installed on a GPT partition can only be booted in UEFI mode. Most Windows 10/8 computers come with UEFI firmware and Secure Boot enabled. ![]() ![]() Solution 1: Enable / Disable UEFI Secure Boot In this tutorial we’ll guide you how to troubleshoot the problem of operating system not found / missing in Windows 10 or 8. This issue can be caused by various reasons, such as MBR (Master Boot Record) or DBR (DOS Boot Record) is damaged, the BCD (Boot Configuration Database) is corrupt, or your system partition is not active. While booting Windows 10 or 8 computer, you might receive the following error message:
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