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Windows 7: Booting Windows 7 in UEFI, GPT and Secure Boot mode aside W10.

29 Aug 2018   #1
Vedita BR

Windows 7 Ultimate SP1 32bit
Booting Windows 7 in UEFI, GPT and Secure Boot mode aside W10.

I have slipstreamed a install.wim of Window 7 Enterprise x64 with updates language pack and necessary drivers. That was done within Windows 10, and withe ImageX i applied the install.wim to my D:\ Drive and i ran
cdboot D:\Windows
to add windows 7 to the boot list. However, Windows 7 cant boot, it shows an error saying that
\Windows\system\winload.efi couldnt have the file signature verified "0x000428".
What can I do? I dont want to mess with my GPT partitions, as i want keep them OEM as long as possible...

My System SpecsSystem Spec
29 Aug 2018   #2

Microsoft Community Contributor Award Recipient

Vista x64 / 7 X64

Did you turn secure boot off?
My System SpecsSystem Spec
29 Aug 2018   #3

Windows 7 HP 64

Win 7 isn't compatible with secure boot. On BIOS, turn it off.
For the installation also turn Fast boot off.

To install Win 7 on a EFI-GPT disk you must boot the Win 7 installation disk as UEFI.
The installation disk must have \efi\boot\bootx64.efi

EFI file
My System SpecsSystem Spec


 Booting Windows 7 in UEFI, GPT and Secure Boot mode aside W10.

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