Your camera is probably too new to work in Lightroom 4.4
Please state what camera it is so we can advise.
the new camera is a Nikon D610
The D610 requires LR version 5.3 or newer.
If you don't want to upgrade, you can download the current DNG converter and convert the NEF files to DNG before importing the DNG files.
Thanks Joe. I guess it's past time for an major upgrade. TMc