I having the same issue. Really quite irritated with Adobe. Just getting here to this forum and being able to post a comment was a collasal pain.
I've tried x64 and x86 combos, UNC rights (including Everyone Full Access), and mapping drives. If I copy the install locally, it works. I don't have as many workstations as some of you, but I still find this unacceptable. And the 'help' page they send everyone to- referencing CS3, 4, and 5 and Windows Vista, but not CC? Really?
Here is a blog post I found that some of you may be able to leverage. He ends up setting it up to copy the files to the local machine for install, which I really don't want to do, but maybe it will at least get some people back into a little more hands off install, the way an enterprise is supposed to operate.