I'm still experimenting with my D70s! I shot some photos, transferred them from the camera to a folder on my PC and was able to read the EXIF data via Properties>Details. I just tried again and the data are missing!
What operating system are you running and were the images in raw or jpeg format? if they were raw try installing the Nikon codec if your operating system will support it.
Very weird. After I posted this, I tried again and the data had returned. But I just tried again now and no data! I'm still running 8.1 and I these are not yet processed. Some are jpeg and some are RAW.