beta 2 installation failure complaining non acpi compl

Beta 2 installation failure complaining about non-ACPI compl

I have an IWill DK8N dual operton motherboard, latest BIOS 1.11, and Vista Beta 2, both 32- and 64-bit versions fail at the installation stage, blue screening after the loading files screen with an error 0x00000A5 (subcodes 0x17 0x22).
This PC is running XP SP2 quite happily with the ACPI Multiprocessor Kernel, as I said this is the latest BIOS available, and a fairly recent motherboard (less than 18 months old).
I couldn't find any clues as to what the subcodes for the STOP error indicate, which would possibly help me track down the problem.
Any ideas on how I can pin-point the issue more rather than just give up completely on installing Beta 2?

Windows Vista

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