Vista - Burning CD's on windows media

Initially I was trying to burn songs to a brand new CD from bearshare when I
kept getting a message to "insert a recordable CD". There was already a CD
in the drive, so I put another one in, same message. No matter what I did,
same message. So I tried to burn from Windows Media Player and kept getting
the same message. I've tried burning audio files of me speaking onto a CD
with same results. What is wrong?

My new email address is lpncal@xxxxxx the other one no longer exists.

Thank you very much!