How can I get downloaded content to show up in my Xbox 360 Games?

Here's the situation. I went to my friend's house, and I brought my Xbox 360 Hard Drive. I decided I'd buy Fable 2's See the Future add on. I did, and I went home later. I tried Fable 2, but the content wasn't there! This also happened earlier with Guitar Hero World Tour songs. I looked in the... show more Here's the situation. I went to my friend's house, and I brought my Xbox 360 Hard Drive. I decided I'd buy Fable 2's See the Future add on. I did, and I went home later. I tried Fable 2, but the content wasn't there! This also happened earlier with Guitar Hero World Tour songs. I looked in the memory, and it's there, but it wont show up in the game. I was on my name, when I bought it, too. How can I get it to work?
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