Thanks Richard, but Ctrl+A made little difference with the XP viewer. The picture is still OK, though not perfect.
And the problem isn't "the line", there are dozens of closely-space light/dark vertical stripes. The stripes are really just a modulation of the image brightness. Sorry for the poor initial description.
I'm guessing that the source of the problem could be if the pics were projected onto a beaded screen and there is a "beat" between the bead spacing and the camera's pixel grid. But how does the XP viewer suppress this effect?
If only the nephew had "done it right" in the first place and didn't have so much time invested in the CD.