I have a Windows 2012 server that is running Hyper-V. A remote system NOT using the original Administrator local user account needs access. The original Administrator can access \\SERVERNAME\c$ and \\SERVERNAME\admin$ without an issue. A local user with
all the same privileges and group memberships as Administrator can't.
I've tried to apply solutions from other postings, namely:
Microsoft is conducting an online survey to understand your opinion of the Technet Web site. If you choose to participate, the online survey will be presented to you when you leave the Technet Web site.