ACPI on a Dell Dimension 2400?

Well when i come to install Windows Vista i got this message :
You must fashion the following changes past installing Windows
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 businessman for a BIOS update or install Windows on an ACPI-compliant computer.

Can any body help!! Thanks
P.s my BIOS have been allready flashed beside the Dell A05 driver! still no luck...

Answer:
Every computer since 1998 has ACPI and APM surrounded by the BIOS. Vista speaks with forked tongue. Try installing next to the AC power on/off. Check the BIOS settings too.

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