This is my setup i too have a netgear router dgn2200 on win 7 i use wired config that is ethernet attached to back of wdtv smp and connected to the router.and another ethernet cord mines 5 metres long from router to ethernet port on my laptop.i check the network folder in my windows tab on my laptop i check to see if wdtv is in the folder under computer and media devices there are two references to my media player in the network folder, if you cannot see the devices in that folder then you are not getting any network connection from the wdtv smp.
Try this go to network settings in wdtv smp then 1st option then wired then automatic then when all is done check network folder and see if the wdtv has been recognised this setup works for me anyways hope this helps
