many people have multiple problems when booting XP from a RAID array of any type.
if you want to keep your raid setup, get another smaller drive to load windows on. then setup the 2 HDs with your raid controller and away you go.
I've been booting XP on RAID since XP exist... and never had a problem..
Problem happen when people assume they understand what RAID is, but don't have a clue about that, or which controller the motherboard has or which connectors are controlled by which controller.. They don't know which drivers to use, nor have no clue about BIOS settings..
Or maybe I'm just better and smarter that most of them...
If I understand correctly you want to keep your existing OS while moving it to from your current non-RAID setup to new drives on a RAID 1 controller.
Your concern is your OS has drivers for another pevious RAID controller.
The old drivers will not pose any additional problems.
However XP will often only boot from a
Storage Controller if you pressed F6 and loaded the drivers when XP was installed. Occasionally you can get away with loading the drivers before moving windows to the new setup.
Its very likely you will need to do a repair install or a full install to get the system to boot from the new RAID controller.
Its also possible that your disc imaging software won't be to worth with your RAID controller.
Since you will have the old drives as backup there is no harm in trying to move your OS, but the only sure bet is to do a clean install to the new arrasy then copy over anything you want to keep from one of the old drives.