Windows Server 2008 Xen HVM installation fails - Firmware (BIOS) is not ACPI compatible

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When attempting to install Windows Server 2008 as a Xen HVM domainU guest the installation process fails in the early stages with a status 0xc0000225 message which reads: 

Info: Windows failed to load because the firmware (BIOS) is not ACPI compatible.

The entire error screen displayed my the Windows Server 2008 installer appears as follows:

Windows Server 2008 failing to installl under Xen

ACPI (Advanced Configuration and Power Interface) provides an interface used by operating systems for hardware recognition, configuration and power management.

The reason this error is occuring is typically because ACPI has not been enable din the Xen domainU configuration file for the Windows Server 2008 guest. By default this support is displayed so unless it has been specifically set in the configuration file the Windows Server 2008 Xen installation will fail. This value can be set in the domainU configuration file as follows: 

# enable/disable HVM guest ACPI, default=0 (disabled)
acpi=1
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