You need to provide more info. Is this array going to be the system drive or
just data storage? If the latter I highly recommend against it, if the
former you need to have a good backup routine in place.
You can take your current Vista installation and migrate it to a stripped
array but it is not a simple task.
Basically, you need to enable the RAID controller and install the drivers in
Vista, then use an imaging tool to image the single drive to the array, this
usually works but you may run into problems, also you may need to change the
BIOS boot order and set the array as bootable in the RAID setup utility.