Due to consumers and pundits pummeling the OS makers about security you don't see an option to share the C drive.
And if you research how to, you do see more about this.
I'm going with no. Not going to happen today. You can share most folders, but not all.
Just got a new Win8 computer and added it on my LAN. Currently have two Win 7 computers, and a Linux Media computer on the network. I went into the HomeGroup settings on each computer (except Linux) and opened them up for sharing everything. But, I can see the other computers, but only what is in My Documents on the Win7 computers and the Media on the Linux. How do I open up the network to allow sharing of everything on the computers?