I have a Sony Vaio running windows Vista. Every few days my iTunes library goes and erases itself. All my music, videos, etc. are still there in the folder where I left it, but my playlists, settings, Genius and various other technical stuff associated with the music's use in iTunes is 100% erased and reset to default.
I've been dragging and dropping my library back into the thing and allowing the library to fill up again, but obviously I'm sick and tired of doing this every week or so.
I've tried making a new library folder in a different location, no dice.