Oblivion expansions problems

I recently purchased TES: Oblivion: GOTY Edition. I have played through the game on two characters, so I wanted to try the expansions that came on the second disc. So I installed the expansions onto my 360. The expansions will not work though. I will not get the quest log update for the Shivering Isles, even after waiting 24 hours. I have tried uninstalling the game and the expansions reinstalling just the expansions, but it doesn't work that way either.Does anybody know how I could get the expansions to work?Oblivion expansions problems
On the first occassion before playing Oblivion G.O.T.Y.E.. insert disc 2.. after a few minutes the downloadable content will permanently be downloaded to your hard drive ( then remove disc 2, you only need it once ).. Then every time you want to play 'Oblivion G.O.T.Y.E' just use disc 1.. Put disc 2 back in the case and completely forget about it..Then every time you load your game (using disc 1) it will pause for about 15-20 seconds informing you that it's now downloading the additional content from disc 2 which is now 'perminentally' installed to your hard drive.. once you have done this you will be able to play 'knights Of The Realm' and 'Shivering Island' anytime throughout your Oblivion experience.. Shortly after starting your game the very first time, you will get a message imforming you that a strange island has appeared (that is your Q imforming you that 'Shivering Islands' is now available to be played when ever you require).. To start 'Knight's Of The Realm' talk to the crazy guy shouting his mouth off outside one of the churches.. (Use the 'Knight's Of The realm' location video on 'You Tube' to find his exact location (I can't remember)Your lesson for today is 'ALWAYS' read the manual, ESPECIALLY' when two discs are concerned.Game on !