On elder scrolls 4 oblivion game of the year edition for the xbox 360 you tried to install the expansion pack and it didnt even work

The 2 expansions are not obvious at first, you have to activate them in game while playing. One of them is activated by going to a new island near the main city, it is shaped like a big skull. The other (Knights of the Nine) is activated by talking to a certain character in the game. Just keep looking and you'll find them.