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Fail to boot: winload.efi missing; error 0xc0000359
I upgraded ok with the update and successfully activated windows 10. I downloaded both 32bit and 64bit to usb using media creation tool as I wanted to clean install Windows 10 64bit on my 64bit compatible machine although am currently running 32bit windows 7 as that's what I had to hand when I built the PC. If I attempt to boot 32bit from usb it returns the error winload.efi missing. If I attempt to boot the 64bit version it just returns to windows boot manager.
Frustrated, I opted for the "reset this PC" function in settings instead as an alternative to the clean install and the reset failed, hung, then returned to the screen "what would you like to do". Once I selected "turn off PC" and it restarted and automatically continued the reset only to fail a second time. This time I choose to "return to windows 10" but it just hung. I had to rollback to windows 7 with repair dvd.
With windows 7 now installed again, I still cannot boot from either the 32 or 64 bit option in windows boot manager when I select to boot from the USB. It either returns to the boot manager or returns the winload.efi missing error.
I have tried changing settings in bios to disable secure boot and fast boot but it makes no difference. I've read the Andre da Costa (sp?) wiki steps along with countless other how-to-clean-install windows 10 guides.
Thanks for any help.
mobo: ga-ha81m-dsv2
Error 0xc0000359 winload.efi