H.256 "Volume Cannot be found"?

My friend recently recorded a ton of video using a Hauppauge(Sp?) HD PVR, he messed with the audio settings right before recording, setting it to "Audio Output" after everything was recorded he's now getting a message saying "Volume Cannot be found" and as soon as he exits out of the error the video crashes, he's using a Mac book pro, and the files are encrypted so he can't post them online, anyway to salvage the video? any way to put "Volume" into the video to have it NOT crash? we would love the video he recorded, it's not able to be re-created and if he deletes it it's lost forever, any ideas?