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Also check the info on one of the .nef files and be sure it is as large as you think it may be.
Are you opening them, or importing them? Try importing.
Also, if you haven't done this, try rebooting your PC. On a Mac, I would repair the permissions. Don't know what the equivalent is on the PC.
You could also download the free demo of Lightroom, or Photoshop, and see if that works...
Thank you for the input. Sadly nothing seems to work but I've had a similar experiene with film where I didn't notice that the take up spool hadn't engagaed the sprockets!
Reminds me of the old story about the executive famed for his good judgement. When asked what he attributed his good judgement to he replied "Bad judgement".
Just says it all.