So I formatted my C drive, put Windows 8.1 on. Prior to the format, all my Itunes mp3s are on my nas (Y:\MP3). I installed Itunes, went to edit/preferences/advanced and changed the location to the itunes media folder to Y:\ (which is mapped in windows 8). I click on Keep itunes media folder organized, and copy files to itunes media folder, just as I did prior to format. Now, all my music shows in the itunes library, but has a Cloud with a down arrow next to it. Not sure why those icons are there, and if they will go away (have about 13,000 songs). Any clues?