I downloaded and installed the drivers for my Netgear WNA3100 usb adapter, inserted the device when prompted, nothing happened for a while. I searched online (ethernet cable plugged in) and found that the feature needs to be enabled:
Go to Server Manager -> Features -> add a feature -> scroll to the bottom- > select Wireless LAN Service and click install.You may need to install features one by one.
After this I installed the drivers again, plugged in the USB adapter and it worked. Regular server users probably already know this but I had no idea coming from Windows 7 and using Windows Home Server 2011 or Windows Server 2012 ethernet cable only.