Advanced Micro Devices Inc (AMD)

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XP 64-bit beta is AMD only
[PC Pro] 12:55
Thursday 8th July 2004
The latest version of Windows XP 64-bit Edition for 64-bit Extended Systems does not run on Intel processors, according to Infoworld. The current public beta will apparently run only run on AMD Athlon 64 and Opteron chips.


http://www.overclockers.com/tips00614/
The story is going around that the initial Intel x86-64 processors isn't compatible with Windows XP 64-bit Edition.
Actually, if you read the original story, you'll find out that it's the other way around.....

However, as the article linked above points out, Microsoft already has made the necessary fix in build number 1164 of Windows XP 64-bit Edition, which is already being used by corporate testers. MS will release it publicly in the next version of its beta. This will probably be about the time when any x86-64 enabled chips will become publicly available for sale.

In short, now that we have the explanation from MS as to what happened, it's a non-event.