It's failing to save the file to my desktop. I've got Windows on a ssd and my personal files on a hdd. My personal files (Contacts, Desktop, Documents, Downloads, Favorites, Links, Pictures, Saved Games and Videos were all moved to it through my user file on the left side of the start menu.
I'm trying a trick at the moment to see if it fixes it. I've got the Media Creation Tool making a newer Windows 10 flash drive. When it's done, I'm going to try a upgrade install and see if it fixes things.