Try downloading an audio converter. Sometimes the wma, cda, or aac file is protected by some copyright laws blah blah. Convert it from its original file to a mp3 file. If you're trying to play it on your ipod through Itunes, You must burn the music first in an mp3 format then re-rip it to your pc to use it. either way your bit-rate quality will only be 128 bit.

This same topic was posted in an issue of pc magizine, It may be more help than I am.
Code:
http://www.pcmag.com/article2/0,1759,1763607,00.asp
~PreTenD~