This is your free "incompatibility of the day report".
If you try the above combination, the Vista install DVD will take about a half hour to boot, and will never be able to install.
The moral of the story : if you are going to enable AHCI in your motherboard BIOS, you need to make sure that all your devices are real SATA devices, and not using any IDE to SATA converter. I found this out, the hard way.
The specific components I ran into this with were a Samsung DVD burner, Unitek IDE to SATA converter, XFX nForce 750a motherboard with AMI BIOS, and Vista x64 SP1 boot DVD.