See the first post in this thread below to be sure you have set up Network shares on the media player correctly. I suggest you not use any passwords at first (or later, at all) to keep life with the device simple. If you really want passwords, you can follow the instructions here, later. How to resolve Network shares access problems
Homegroups can be shut off via the Control Panel of Win 7. Be sure the workgroup of your PC matches that of the media player (i.e. WORKGROUP).
If you have never set up sharing on your PC until now, and you have another PC, try to share some files/folders between them at first, and keep the WD player out of the picture until you have success this way.
