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Why? Because then I'd loose the factory installation of Windows 8.1 View 2 Replies What I don't want to do:-Format the drive, change drive mode to MBR to instal Windows 7. I've read booting in UEFI mode is the only way to get Windows 7 to install onto GPT. HOWEVER, Windows 7 won't instal to a GPT formatted drive under Legacy Boot Mode.

What worked:-Enabling 'Legacy Boot Mode': USB stick was recognized upon boot and loaded Windows Installation. Windows 8.1 Advanced Restart -> Boot from UEFI USB Device (No UEFI device recognized) Created bootable USB stick with Windows 7 iso, via 'Rufus' (on alternate Windows 7 system) Created bootable USB stick with Windows 7 iso, via 'Microsoft USB/DVD Download Tool' (on alternate Windows 7 system)

I'm having getting my USB stick recognized as a bootable device (installing windows 7 onto a system that came with windows 8.1 pre-installed, no optical drive) Acer Aspire E15 :: Can't Boot From USB (UEFI) Feb 18, 2015

Boot from usb acer