ME cannot read NTFS, so you will never be able to read files in that format (off the XP machine) on the ME machine, however, XP can read FAT32, so you should be able to see files on the ME machine, via the XP computer.
Have you actually shared a file or drive on the ME machine?
the control over simple file sharing is on the security tab of the Folder Options Dialogue.
the communications are handled by the network protocols the ntfs/fat32 thing is not the problem that lastchip suggests as the me sysyem only has to 'ask the librarian' so to speak rather than actually go looking for the files itself.
Shareddocs is not accessible. You might not have permission to use this network resource. contact the administrator of this server to find out if you have access permissions. the network path was not found.
Firstly as horiz5 says don't mess with your file system it isn't necessary. When you were denied access to simple file sharing were you trying to do this from you XP PC? Because if the files you want to share are on the ME PC you will have to set up the file sharing from there. The easiest way is to just right click and select sharing and security from the available menu. Then select the sharing tab and check the approprite box.