I've been unable to upgrade WindowsXP to Vista or create a new VM. I immediately get the "This computer is not compliant with the Advanced Configuration and Power Interface (ACPI)" message. It never goes as far as asking me for a serial number. It won't boot from the install DVD. I don't understand why some of the people here have been able to install it on Parallels. I get the same problem with 2 different Intel Macs. Since it is a virtual machine after all, is there a "trick" to get past the ACPI?