Rosemary-PC could connect to the network, connect to CHC-HP, and view CHC-HP/C, but when trying to view subfolders of C, received error message saying that "you do not have permission to access CHC-HP/C. Contact your network administrator for permissions" or some such.
After trying everything I could think of, I decided to make all settings the same as on my laptop, which can connect to C. After I turned on password protected sharing under advanced sharing settings and re-connected to the homegroup, Rosemary-PC could connect to CHC-HP/C. I'm not sure exactly why it works. I tried to make the same changes on Mom's computer, but it still does not connect to C. Frustrating!
