We're excited to announce that we've fully migrated the Xbox Forums to their new home, here on the Microsoft Community forums!
As of today, going to forums.xbox.com will redirect you here to the Xbox area of the Community forums. We've moved all of your existing threads over so you can continue and start conversations with the new forums experience.
We sincerely appreciate the feedback you have provided over this transition and can't wait for you to check out the new Xbox Forums!
Unfortunately, to access the Dawnguard content you will still need a copy of Skyrim at hand. Dawnguard is simply an add on, or expansion to the original game featuring new quest lines set within the game itself, not a standalone title.
If you would like to access the Dawnguard content you will have to purchase another copy of the game and then purchase the DLC. I've seen a few deals around that include a bundle of the game and the microsoft points to buy Dawnguard from several retailers,
so perhaps you could use them to your advantage!
On a side note, Dawnguard is a great expansion and I think you'll find it worth it if you decide to purchase a new copy of the game. It's a must have for any Elder Scrolls fan. :)