I have come across the following issue on Windows 7 Pro x64
File sharing broke itself very quickly.. I enabled Public Folder sharing, disabled need for password, copied a few files into it.
Next I tried to copy the files to 2 different Vista 32 machines & an XP machine
The first Vista machine managed to successfully copy the files, the 2nd would show the folders but no files and the XP machine just failed completely citing “You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions. Not enough server storage is available to process this command.”
After a bit of googling I ended up modifying the following registry key
Set it to: 3