I am on the latest version of the firmware, use an officially unsupported wireless N USB.
I have the shares I want visible on my Live.
I have not done any registry editing, no removal of this or that app/driver/service.
I have set a static IP on the Seven machine and on the Live.
I have made the Workgroup the same on both.
I have turned off UAC
I have right clicked on each folder I want to share.
I have chosen Share With -> Specific People
I added Everyone with Read ability.
Presto! I have the folders I chose available in the Live unit. All subfolders as well.
I use Seven Ultimate x64
I have reinstalled the OS a few times and recreated the shares. No problem.
Hope this helps someone.