Seems clear enough.
The physical drive letter or partition letter has changed since those hyperlinks were created, though I can't say why (unless someone has moved the target files).
If that's all that has changed in the hyperlink path, simply edit the hyperlinks (change 'D' to 'C'), or move the target files back to where they were originally on drive D.
Incidentally, I wouldn't class this as "corruption". It's just an incorrect path for whatever reason.