Open a Command Prompt, cd to the drive containing your music, and run that (as an administrator). The problem with using NTFS on an external drive is that it stores file permissions for each user that touches it. So when you hook it up to a different computer, the permissions get fubar'd. Running take ownership won't fix this either. Also, if you value your music, stop storing it on an external drive. You're gonna end up losing it when a bad sector comes along. Might be tomorrow, might be in four years. Take it from someone that lost around 10,000 songs and 200 movies and shows. I used an external for a few years as an NTFS home directory that I could use between Linux and Windows, and then one day poof. Half of everything I had was gone. They're not designed to last. I recommend signing up for Google Music. They let you upload 20,000 songs for free that can be played anywhere. If you want to invest the money, you can get a NAS and run a media server at home and then install something like Subsonic or XAMPP and just stream your music from wherever you are.