Windows DVD Maker

I have a problem that I did not have before. I have 30 minutes of slideshow.
I have an audio file--it's 3:04 minutes. I added it enough times to total
at least 30 minutes. However, after I burned the CD and played it back, the
audio selection stopped playing after the first time, so that the remaining
slideshow had no music at all! I just made one a few months ago, and it
worked! Now it won't work no matter what I do. I want the song that is 3:04
minutes to continue to play throughout the entire length of the slideshow and
it won't work anymore. PLEASE HELP! I have Windows Vista. Thank you.