So here is my setup, I have vista in boot camp. Now I have installed parallels 3.0 Everything looks good, but the first time I tried to start the "My Boot Camp" VM I get a windows error screen. Windows failed to start. A recent hardware or software change might be the cause. then at the bottom It says. Info: Windows failed to load because the firmware (BIOS) is not ACPI compatible.
OK jsut for the sake of anyone who may run into this same problem. Becaseu the "my Bootcamp" VM was created so quickly I didn't get a chance to edit the pramiters of the VM first. Basicly I went in and amped up the ram usage all the way and it worked fiine after that. Good Luck.