I'm not sure what the problem is. It appears you're using windows and I did it on a Mac. What I would check is:
1. Did you succesffully download and install exiftool?
2. If so, I'd be very careful on the syntax for the location of your files, and I'd put the D7100 NEF files in a special folder for this process. And I wouldn't reference the file name, but the folder name. So if the files are all in Pictures\New Job then reference the location as "c:\Pictures\New Job".- it's very important to use quotes if there are any spaces in the folder or file name.
I'm not really a computer geek so that's the best advice I can give. Hopefully Adobe will get their act together soon and come out with the D7100 RAW converter.