You have to move the ProgramData folder back to C:, the Users folder can remain on another drive. Run sysprep again, exactly as told in the tutorial but edit the information between the <FolderLocations> tags (lines 5 to 7) so that it looks like this:
Originally Posted by Seb
See my response to Seb above, in your case you have to edit <FolderLocations> tags to look like this:
Originally Posted by ScottThePilgrim
After the upgrade you can no longer move the Users folder back to your data drive; an upgraded Windows cannot be sysprepped.