Linked by David Handlos on Thu 25th Sep 2008 18:07 UTC
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Member since:
2005-08-19
Some chipsets -- especially some mobile chipsets -- do not support the x86-64, even when the processor does. Also, on some motherboards with x86-64 chipsets the motherboard traces aren't connected for 64-bit addressing. That's likely the cause of the confusion.
Anyone who wants more info can read here:
http://support.microsoft.com/kb/929605/en-us
(Look under the "WORKAROUND" section.)