LA, are you sure it is after the "It is Now safe to turn off.." and not "Windows is Shutting Down" screen this is occuring.

It has always been my experience that by the time you get there Windows has terminated all drivers and BIOS APM is in charge. It either shutsdown automatically, or if APM is disabled waits for a manual power off.

If you have ACPI, it should be Here

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What the Dormouse said