PhabGuy said:
This install *did* create a System Reserved partition, but it made it on Z:, not C:. Since it is Win10 Home and can't use BitLocker, I'm wondering why it did it that way. At least, Z: is internal!!
Well, that is why I suggested you to set all other disks/partitions inactive and/or disconnect all the other HDDs.

Anyway, all is well that ends well.