WHY are you fooling around with a wireless adapter on the WDTV, when you tell us you have the WD wired to the router and it works. WHY do you think you need wireless set up?
Also, I posted this below in another forum today, and maybe it will help you:
How to resolve Network shares access problems - Western Digital …
Here is an instructive video someone put on YouTube regarding setting up a WDTV. Not sure if I agree with all of it; especially the part about turning off Windows media streaming in Advanced sharing settings of Windows… What do you folks think? Any other comments about it?