Ok Well I seemed to of found a registry fix that would stop it, and it's kind of simple to. I more or less blocked the Zune software from the Zune Musicnet site.
I used the Easteregg hack and just removed all the Trusted Domains. IT stopped downloading right then.
Here's a screen of ZuneBoards in Zune Software, with out the Zune Software having a marketplace catalog. Oh, and if you notice it says ZuneBoards Not, Marketplace, I had to edit the ZuneLoc.dll to change that.
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Killer Turtle Software --- Making Defunct Software work for you.
http://ktsoftware.net
I'm working on updating my website, so it will have everything I have worked on and news on what I am currently working on as well.