If you go here
http://www.sony.co.za/support/faq/222489/p...site=hp_en_ZA_i
you will find a tool to convert atrac to mp3. it will only convert things you have ripped yourself, not anything bought and downloaded. You also have to have Sonicstage *shudder* installed. This is probably what got you into this mess in the first place.
Peace out