Its a virus!!!
I had this problem yesterday and it took ages to fix,
I discoverd i was suddenly shareing 1500 more files from a new folder called uploads.
The uploads folder is well hidden and i could only find it by typeing in c:\uploads into execute command,it contained just over 1500 zip files all with different innocent names but all where 434k.
Ad adware would detect it and delete it but it would return when i rebooted.spybot didnt detect it and after looking on a pc support website i got rid of it by manuelly deleteing the contents of the uploads file and then useing 'panda software activescan'.
I suggest all limewire users check their monitor window for the uploads folder to make sure they are not infected too.