Welcome to the forums! The NW-A808 is a great "old-school" player, so you need SonicStage to transfer music to it. Get SonicStage version 4.2 (unless you are running Vista, in which case you need SonicStage 4.3), e.g., from here: http://forums.minidisc.org/index.php?s=&am...st&p=117697 ________________________________ Thanks Avrin I use windows media player to transfer my music files that's easier. The thing is (maybe I don't understand you very well, sorry) that the software on the Walkman it self is gone. And I wonder how I can get that back on my Walkman. Do you have any idea?