Cannot read or extract NEFs from some DNG files

Hi, I'm hoping someone can help.
I've got a subset of DNG files from an older shoot that have somehow become undreadable. There are 119 bad files out of 1436 total images from the shoot. All of the bad files are in a consecutively numbered range (e.g., they are not randomly distributed).
I'm on a 64-bit Windows 7 system. The bad files do not open in Bridge, Photoshop, CaptureOne, etc., nor will the images thumbnail in Windows Explorer using either the Adobe or Ardfry DNG codecs. I have no idea when or how the corruption occurred, whether is came about from use of a software program, or had something to do with a bad file copy operation. But my current backups are also corrupted.
However, I always embed the original NEFs or CR2s in my DNGs, and so I was hoping to extract the originals. However, the DNG Converter refuses to operate on these files, though they appear to be of the right size.
Does anyone know of a way to salvage the original RAW NEFs from these damaged files? Is anyone at Adobe looking for a little science project? :-) I would be grateful for any suggestions...
Thanks very much,
Gary

I will attach a link to a troubleshoting document for this issue. If this does not resolve the issue you could TRY a restore to befor the issue started occurring, or a recovery MIGHT do the trick if it is not an actual hardware failure in the optical drive. The clicking concerns me that it might be a hardware issue... is it the typical clicking that you will hear when a disc is initially being read or is it a more aggressive clicking??
There is a fix in this link http://support.microsoft.com/kb/982116 that has you go in and delete the upper and lower filters in the registry. It is a little tricky, so I suggest you follow it WORD for WORD once you are actually in the registry.
I have seen deleting the upper and lower filters resolve most optical drive issues that were not hardware related.
I work for HP

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I thought that maybe serializing the ArrayList might be faster than creating the ArrayList by iterating over each line in the text file. But alas, I was wrong. Here's my code anyway:
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long updated;
WordList readWordList(File file) throws Exception{
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hwnuu
nhpgaucah
zfbylzt
hwnc
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Text file size: 892K
Serialized file size: 1.1MB
Time to read from text file: 795ms
Time to read from serialized file: 1216ms

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Revision: 14083
Revision: 14083
Author:   [email protected]
Date:     2010-02-09 22:48:11 -0800 (Tue, 09 Feb 2010)
Log Message:
Removed svn:executable property from some .xml files in trunk.
QE notes: None
Doc notes: None
Bugs: None
Reviewer: None
Tests run: ant checkintests
Is noteworthy for integration: No
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Cannot read or extract NEFs from some DNG files

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