I'm mystified by how this can be different based on which card is used. I can see the PC not being able to read the RAW files, and that would be fixed by installing the Nikon software.
I can't see how you can read from one card and not from another, though.
I'm a long way from technically brilliant, but that is what happened originally although it now appears that it will not read either brand card.
Don't forget about the Gallery. Are your photos there??
Nikon Samurai #13
"A photographer is known by what he shows not by what he throws. The best photographers have the biggest trash cans." Quote from Nikon School sometime in the early 1970's.