?USE WITH VIRTUALIZATION TECHNOLOGIES. You may not use the software installed on the licensed device within a virtual (or otherwise emulated) hardware system,? reads the EULA.
That doesn?t preclude Vista Home editions from being installed on Macs running Boot Camp, however, since Boot Camp isn?t a virtualization or emulation technology ? instead, it makes Windows run natively on the Mac. For now, however, Boot Camp is still in beta development, and still officially works only with Windows XP.
Meanwhile, the EULA included with Vista Enterprise and Ultimate editions allows that operating system software to be installed on virtual or emulated hardware systems.
?In short, this means that if you?re a user and you want to run Vista virtually, you MUST buy the highest end versions of Vista, or you?ll be in violation of the Microsoft EULA,?
See the link below for a discussion about your issue:
http://forums.parallels.com/nextoldesttothread8128.html
Hope this helps.
Grif
I was trying to install Windows Vista on my mac using Parallels and after trying to install it i got this error:
This computer is not compliant with the Advanced Configuration and Power Interface (ACPI) standard. Windows must be installed onto a computer that supports ACPI. Contact your computer manufacturer for a BIOS update or install Windows on an ACPI-compliant computer.
Any ideas?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic