My non-technically-minded mother is having trouble downloading a shared folder from my drive. 

When she selects "save as," she gets the message to "Please insert disk for the multi volume."

This happened after she first successfully downloaded a folder as a zip file. However, when she tried to extract the contents of this initial folder, it told her the archive was corrupt. All subsequent attempts to download anything from my PogoPlug drive result in the error, "Please insert disk for the multi-volume set."

Please...just trying to walk my mother through this is very difficult due to her inexperience with computers. Encountering the unexpected makes it impossible. Any ideas?