Cant figure out how to login to the PC

1.  If your music  in iTunes is from iTunes store and is copy-protected, the WD player cannot play it.

  1. All my music on the WD player’s drive is from my iTunes folder and none of it is copy-protected, and it all of it is playable.

3.  800GB of music is a LOT of music.  I have “a lot”, too, 80GB of music, and it takes over an hour for Windows to process it for sharing.  Your situation will take HOURS to do same.  So, read and follow what is discussed here.  It helped someone last week who had a similar problem as you have:

“There is no media in the current folder.” (Oh yes there is!)