Windvd Audio Problems

Question

Hey I am having trouble importing audio files into my project. I have tried from iTunes and Cd's. Do I have to convert the files to mp3 or wav and if so how do I do that?? When I go into Import media files and find the song I want to import nothing comes up in the file name under audio files and if I try to drag and drop I get this message "Make sure that this is a valid file type and that it's contents have not been corrupted". Any advice would be greatly appreciated. Let me know if you need more info. Cheers!!