First, the Homegroup feature of Windows 7 has no relationship with the WDTV, so don’t let that distract you.
Suggestion, but not required: Put all of your media in folder, and divide it up into sub folders however you choose.
Example:
\media\Moms Movies
\media\Lizzies Movies
\media\photos
\media\music
etc.
(For the rest, I’m going off memory, so some of my quoted words may not match exactly… I can’t get access to my Win7 PC right now to double check.)
Second, set up “Sharing” on the PC.
Click the Start button, and in the blank, type Advanced Sharing. Above that, an entry titled “Change Advanced Sharing Settings” should appear. Click that.
In that list, find your “CURRENT PROFILE,” and expand it if necessary by clicking the chevron button.
The following settings should be set:
Turn ON Network Discovery
Turn ON File and Printer Sharing
Turn OFF Password Protected Sharing
Click OK until all is closed.
Now, navigate to the folder that contains your media folder. In the example above, \media\xxxx is in the root, so open up the C:\ folder.
Find the Media folder and RIGHT CLICK it.
Scroll down the menu to “Share with…” and click “People I choose”.
In that list, see if the user “Everyone” is listed. If it IS, ensure that the “Permissions” are set to at LEAST “Read.”
If it is NOT listed, add it using the box provided, and set the permissions to “Read.”
Click OK until all is closed.
That should do it!
Let us know how you fare.