I am having similar issues. First I got the message after buying the new MW3 console and my other 2 xbox live profiles downloaded fine, but this one has yet to work, which is very frustrating because it has all of my microsoft points, as well as the dlc which I can no longer access because of this. It gave me error code 80151103 and I tried changing my windows live password and in turn that changed the pw to type in on the xbox to download it and now it is giving me error code 80070020
I have created a new post/thread for my issue, if anyone could continue to help me with this seeing as I have been battling it since November.
Thank you