My NW-Z1060 came pre-loaded with some Japanese music and I can't delete them. If I connect it up to my PC they don't show in Media Player to be deleted, I can only delete the music I've put on it and there doesn't appear to be an option on the player itself to delete them. Any ideas?

Look in My Computer where your Walkman is recognised as a USB device and click on Walkman there should be some folders labelled Music etc. If you find the music you want to delete right click on it and there should be an option to delete. Hope this helps.