Fallout 3 xbox 360 Add ons not working?

I downloaded all of the fallout 3 add ons from the xbox live market place. They worked just fine and i play them throughout the game. This is the regular fallout 3, not the game of the year edition. I just started a new game and i have gotten no radio signals, havent found the point lookout riverboat, ect. I already have 13 hours into my character and still no radio signals or distress calls. I checked my hard drive and all of the add ons are there and downloaded. I am not signed in to xbox live at the moment and i havent played fallout 3 in over a month I believe. How can I make the add ons work again?

Andrew