Install Windows Server 2003 to Dynamic Disk RAID-5

Is it possible to install Windows Server 2003 to a software RAID 5 on dynamic disks? I have 4 320 GB HDs and I want to have a single RAID 5 volume with 1 spare drive. I tried installing to one basic disk, then converting to dynamic, but it would only let me create a RAID 5 volume on the 3 drives that windows was not installed on. Any help you can give will be really appreciated.