Hi there,
The first issue we've talked about. The second issue is weird... Are you going 64-bit to 64-bit?
Is the .iso could also be corrupted... Check the MD5 hash of your download:
Windows 10 Manual Upgrade & Installation - Microsoft Community
(if you're not sure how to check the md5 sum see this: http://news.softpedia.com/news/How-to-Check-MD5-Sum-on-Mac-OS-X-431080.shtml)