hmm.... looks like it did works for you.... you got the flv file for whatever song that you played in your computer, and your prb is to convert the flv to mp3, right?
well, i use superC to convert the flv file to mp3... it is very easy... drag the flv to superC... select MP3 as you output... and clik OK.... haha! the tiny problem is to find the download link on the superC page... the author is a little anal... so he buried the link.... whithin a whole bunch or explanation after explanation... downlaod link should be at bottom of page... and again bottom of page... you have to kind of look for it.... wait a minute... you used super Converter... haha! is it the same as superC?... duno but here is the link to it....
http://www.erightsoft.com/SUPER.html