Do you have an anti virus cleaner? If so, scan your system to see if it infected any of your files. Sounds to me like you may have picked up something from Gnutella. And, double check your shared folder options to make sure the files you dont want shared are unchecked. Check your prefs to see if the folder had been shared for any reason. or, simply move that folder or, do what I do and rename it so it doesnt get shared.