I had a failed install of Windows 8 over Windows 8 release preview. I wanted to try a new file incase the install folder I downloaded is corrupt. I tried Windows 8 Upgrade Assistant and this is the problem there, the same thing last night too.
We couldn’t create the ISO
Sorry, something happened and we couldn’t finish creating the ISO. Restart setup and try again.
File name: f:\Users\Documents\Windows.iso