Vista APCI compatability issue

Running PD for 3.0 Mac - When installing Vista Business upgrade over WinXP pro I get the following compatability message:

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.
The compatibility report will be saved to the current Windows desktop.

Any ideas?

Note: This worked fine in PD for Mac 2.x.

 

Did you follow the Parallels instructions and do a "Prepare Windows Vista Upgrade"?

 

No I have not! Where can I find this information as I installed PD3 from a DL? Thnx dkp.

 

Never mind dkp, I found it in the PD3 menu system. Thnx again for the help it's much appreciated. Good day .