Since you are using a RAID array you need to refer to youe computer manual for the proper set up procedures for the RAID array that you are wanting to use...Each is different.

If the Raid is set by BIOS setting then you may still need to install the driver files for the RAID/SATA controller:
go to manufacturer's website and download the driver and prepare it for installation as per instructions (make disc ??)

Set the BIOS to boot to CD as first boot order and install the installation disc and follow the prompts. Pay attention to adding the drivers per the F6 method after the first boot to CD prompt. once the drivers are installed use the set-up program to remove all the partitions and create one partition to install to and let it run.

One side note....if you are using a DVD installation disc...your computer has to have the BIOS capability to read the DVD or you will not be able to use it. You might have to slipstream the installation to a CD instead of the DVD.

Good luck!