Thank you: this looks very promising! For clarity, I downloaded "Win14393PESE_x64 ISO v170116 (New)". I downloaded that .iso file, then unzipped it to a formatted FAT32 USB stick. Then I booted the...

Thank you.
Here is what I see when I do that:

==========
Microsoft DiskPart version 10.0.14393.0
Copyright (C) 1999-2013 Microsoft Corporation.
On computer: DAVIDMAIN
DISKPART> list disk ...

Hi axe0.
Thank you.
So, I used Disk Management to Shrink a partition to get a spare 1GB.
Then I tried to create a new EFI partition using diskpart's "create partition efi size=260" command.
But...

Thank you. I am still skeptical about it being MBR, because we have an identical machine with identical hardware and OS and it has a EFI Partition on its SSD. Is there a test I can do to confirm I am...

Certainly... I have attached a screen capture, inline:


121974

Thank you very much, Axe0. Your words are helping clarify this for me.

I'm somewhat confident I had an EFI partition before things went wrong, but I am not sure. How can I determine if I am GPT or...

Thank you lifetec, yes I am up for that!

However (because I've never done something like this and don't want to screw up),
I an unclear on this point: is my goal to convert that last drive list...

Thank you for your prompt reply and help!
I have the problem whether the USB stick or the main hard drive (it's a Samsung SSD) is earlier than the other in the BIOS's Boot list, so I don't think...

Hi fenix,
I think I have the exact same problem: the brilliant solution documented above got me from not being able to boot my Windows 10 world yesterday to now again being able to always boot my...