Darn. I covered all this in the Help Forum, but that forum isn't working. Eagle - go to our links page and try some of the MIDI sites noted there, particularly Taylor's Traditional Tunebook (click), and see if those MIDI files work for you. If you download a file and double-click on it, does it play?
If you have Windows 95/98, have you downloaded the latest (free) version of Windows Media Player (click)? I also have come across a number of people who have had problems with Crescendo. If you have that program, you may want to uninstall it and see if that helps.
-Joe Offer-