You have photoshop 7 or photoshop elements 7?
Which operating system are you using?
What camera and model are the camera raw files from?
Unless the nikon nef files are from a very old camera, you can't open any camera raw files into photoshop 7.
And those old camera raw files required a pay for camera raw plugin (camera raw 1.0) from adobe that is no longer available.
There are several third party raw converters out there or you could upgrade (buy photoshop cs6 or subscribe to photoshop cc 2014)
Also , there is adobe photoshop elements and adobe lightroom, both of which are cheaper than buying photoshop cs6.
Opening NEF files in Photoshop 7 is a hopeless case, IMO
(PhS 7 is by no means bad, I'm still keeping a version alive).
You may try a Nikon program (Capture) and export from there as TIFF,
which can be handled by all PhS versions:
Best regards --Gernot Hoffmann
Nikon D100 and Windows 7.
You won't be able to open those d100 files directly into photoshop 7, so i would try G. Hoffmanns's suggestion about using Nikon Capture NX-D
Many thanks for your words of wisdom. We have downloaded software from Nikon, which appears to be on a 30 day trial. But we are up and running……for now.
Thank you all for the advice, very much appreciated-up and running.