You have to create a network bridge to get xbox live and media center both to work. Try googling it, its what I do with my laptop. If you can't find a tutorial how to do it after some searches I'll try to look for you.
Even if we get the key, thats only like the "hint" key. Then we can decode/decrypt with it. Its like National Treasure 2. We have to steal the key, then decode it.
I think one shade turret on guardian up on sniper3 by the fusion coil might make for a decent tower of power game. I dunno tho because you can really test it out. I say shade turret because its non-detachable.