Unfortunately Nikon cameras only support ad hoc wireless connections, which means the camera creates a new wireless network that you must connect to rather than having the camera connect to your existing infrastructure wireless network. Canon cameras support the infrastructure mode. If your system doesn’t have WiFi then a great USB WiFi card that I use is the TP-Link TL-WN722N – it sells for $12.84/USD on Amazon:
When you use this card be sure to change your camera’s IP address to 192.168.2.1 if your router is at 192.168.1.1. I have instructions on how to do this in the user guide at http://testcams.com/airnef/