Visibility?
 

How do i keep the other computers on my network from seeing my downloaded files? the other computers on the home network (there are two others) see my files.

I only know this because Itunes on the other computers has a folder by the playlists that say "John's Limewire" or something, and all my files are visible.

how do i stop that?

There are programs that will hide Folders. I'm not promoting this program and I've NOT used the program. It offers a Free Trial so you may give it a try.

Folder Security Software - Folder Hide - Folder Security :: Hide My Folders

There are others that do the same thing. Google Search for more info.
Hope this Helps. :D