The D7100 was first supported in Camera Raw 7.4 and Lightroom 4.4 so there's no reason for them not to open in Cloud versions of Photoshop or Lightroom.
How are you getting the NEF files from camera to computer? Some Nikon software is known to alter NEFs enough so that Adobe software cannot read them.
If you're using Nikon software, try eliminating it from your workflow. Use a card reader instead.
You can also try this utility to recover the NEFs Fix Corrupted Nikon NEF Images
I uploaded them from my camera via View NX 2 onto my Hard drive and from there I was trying to upload them into Lightroom. That didn't work so I've used another program, Adobe DNG converter 9.5 to convert the NEF into DNG and then upload them to Lightroom which seems to have worked, however, the quality of the photos seems really poor. Very grainy. When I shot in JPEG the quality I think was several times better so I'm super disappointed atm. I'm hoping that it is a matter of the software corrupting them?
Then again, I also think this camera isn't right.. I got it relatively recently after my D5100 was stolen while travelling, and it seems the white balance on it is way off unless outside in the sun, some of the functions don't like to work. Think I need to have it looked at as well.
I'll try uploading pics via a card reader and see if that makes a difference. I had uploaded them onto " My Passport" Harddrive as well as a backup while travelling.. would uploading from there prevent the corruption do you think?
Sorry, I'm really quite new to RAW and NEF.