I have a Velociraptor drive with Win 7 Pro already installed.
I would like in future to buy another Velociraptor drive and set up Raid 0. I have never set up Raid before and was wondering do you have to reinstall Win 7 Pro when I set up Raid 0? Is there a way to set up Raid without losing my disk image?
There's no way to "convert" a single disk to a RAID-0 volume. So you'll either have to reinstall Windows and all your applications, or make an image backup of your partition and then restore it to the newly-created RAID-0 volume.