Update for the Update coming.....
11/1/2006 7:07:00 PM
John Porcaro over at Gamerscoreblog announced today that a fix for the fall update is in the works. It should be available in the next 12-24 hours, and will be for those less than 1% (Microsoft's figure) of Xbox 360 owners that suffered some sort of issue when updating their dashboard.
In the meantime, the suggestion is to call 1-800-4-MY-XBOX is you are experiencing problems.