So, I figured maybe the only one is to MOVE that unallocated space NEXT to the reserved partition, but I can't find how. But whichever one it is, the 16 MB one or 100 MB one, they happen BEFORE my C:\ which is THEN followed by any extra space I try to create, as in the screenshot below which shows a 200 MB unallocated : Oh, and by the way, I've tried that one and AOMEI Partition Assistant Technician Edition 6.5, and MiniTool Partition Wizard. I'm still confused as to if it's my 100 MB partition named 'GPT (EFI System Partition)' or the 16 MB named 'Reserved Partition' which I see using EaseUS Partition Master. The problem is, I can't resize it bigger because when I create a new chunk of unallocated disk space, it's not adjacent to that partition. I *think* it's based on the fact my reserved partition isn't large enough. I've also tried disabling all Anti-Virus etc to no avail. I get errors saying something like 'couldn't write to reserved partition' (or something about the reserved partition), and an error code which I forgot but the new error code is: 0xc1900200
I'm not trying to upgrade from Win7/8 to 10 but from Win 10 (Version 1551 (OS Build 10586.1176)) to Windows 10 Fall Creators update. So I'm pretty much out of options after Googling and trying over & over again for a week so I'm hoping someone might have advice: