HELP Importing sound to Flash CS3 ~PLZ!

Can someone PLEASE tell me how to import my mp3 file? I have 2 songs I would like to loop. I have both mp3 & wav files.

Here is what I have tried:
File/ Import/ Import to Library.

I get this error message EVERY time with BOTH file types:
“One or more files were not imported because there were problems reading them”

I’m not sure WHAT to do at this point.
Help please!!!
Thanks in advance ~This is my first post. I’m a new member! :beer: