Is there any chance that you used an older version of Nikon Transfer to download the images from your camera? This can sometimes create problems with some or all of your images.
I had this happen with a couple of image files the other day, my solution to the problem was to re-copy the problem files from the card. Didn't have anything to do with the software I use being out of date.
my solution to the problem was to re-copy the problem files from the card.
Consider checking your disk drive, or just getting a new one.
If known good (on disk) files go bad, problem is usually disk (or ram).
If files known to be good on card, are bad after transfer, problem is usually with the transfer hardware.
If files bad on card, problem is usually camera or card, but may be reader...
Problem is not likely due to DNG Converter software (nor OS) - sorry Jeff if not worded strongly enough for you.