Resetting HDD due to Vista

[super777]

My friend bought a new computer that came pre-installed with Vista. He isn't liking it, so he wants his computer to be reverted to XP. I figure that the best way to do this is to clear his HDD, and install XP onto a clean system. He currently has two drives in his computer, I'm assuming that he has a RAID 0 set up, but the second may be a regular slave drive. I am wondering how I could clear both HDDs, and then set up RAID 0. I know how to put XP onto his system, so that step can be skipped. Also, would there be a better way of doing this? I really don't want to leave Vista on his system. Thanks.

 

[SuperFly03]

Why not just hit f6 during XP install, install raid drivers and then use the XP installation disc to format the array?