I can connect to Xbox Live fine, but when I selected my profile I had to go through the proofs. After entering my password, I got error code 80151011. I did all the steps in http://support.xbox.com/en-US/xbox-live/errors/error-code-80151011 (New security information, restarting the console, Deleting and re-downloading the system update), and decided to do the USB step last.
I put in my info, and it started downloading my profile.. but then I got the error code again after a few seconds. I tried to sign into the profile, but it said that it wasn't downloaded properly.
So, I am kind of stuck now. At first it was just the proofs part; but now its getting my profile back too. Any solutions?