I'm having problems playing a music file (wma format) with windows media player and also 2 video files (meg & mpeg) with quicktime player. The error I receive from windows media player is "the specified stream type is not recognized" and from quicktime, "quicktime cannot open -file name-. It is not a file that quicktime understands (-2048). The question about iTunes is when they rip songs out of my CDs, it is in a m4a format. How do I convert it to mp3 format? Thousand Thanks!