Codec Error Message

[mae mcm]

I just created my first slide show with Elements 5 and I wanted to use the music sunny_afternoons.mp3 that came with the program, however, I get an error message that says I don't have the codec. I know it's about compression/decompression, but I don't know how to go about getting it. Can anyone help me with this. Thanks in advance.
Mae:confused:

[skstarkiller]

try www.free-codecs.com

[mae mcm]

Thank you Phil, I'll check it out.
Mae