hi,  i seem to be having a bit of trouble with my laptop,  its always saying im low on disk space..  im my documents, i have a music folder,  which contains about 17 GB of songs..  i have no games,  as i uninstalled all them trying to make space,  but also have an itunes folder with what looks like all my music aswell,  is this a back up?  or can i delete the other music?  any help would be great!