I checked the "mute" setting wherever I could think to, and found no mute boxes checked.
Signed in as the administrator, and went poking on the control panel (it's rather different than it was the last time I was very familiar) and went to sounds. Looked around, and didn't see anything queer, but noticed that it went "boop" when I clicked on one of the sound-names.
Cool. Signed the admin out, signed me in ... and was never so happy to hear the funky Windows tunes!