I am the person that will be helping you today.
More often than not, this problem has to due with faulted dns cache. The way to fix that is to unplug the power to your modem & router, plug them back in, turn the Xbox 360 off and on, and then update once more. When you do that, you will be all set.
I look forward to hearing your feedback concerning whether or not your problem is fixed.
I hope to hear back that all is working. If this is so, please do not forget to rate my help on the top of this page (choose the number of stars and click the Submit button). If it is not, please respond below.
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