Nero Express 2 Audio Importing from Napster

Please somebody help me. I just had a DVD burner with Nero Express 2 installed on my comp. I am trying to make a slide show with music that I have downloaded from Napster. Before I had this installed I was using Windows Movie Maker and was able to import a song from Napster. I burned the song on my CD and then ripped it into Windows Media Player. That’s the only way it would let me import it. Since I’ve had this new stuff I can’t seem to get any songs to import from Napster. When I try it in Nero it just says it can’t import it, so when I try it from Win. Movie Maker it says “protected using digital rights management and cannot be imported”. What am I doing wrong?