Whatever happened in the first place, you changed the RAID setup and that's why you no longer can see what's in the original HDs. To stand any chance of success you have to restore the original RAID config. Even then I'm not sure if it'll work since you've disrupted the RAID. Leaving the drive letter issue aside, doing a repair isn't going to work, because I doubt if Setup can see the old HDs - if it does it'll list it and ask you which Windows you want to repair. It's never a good idea to have RAID 0 with no fault tolerance and not having a regular backup. If you have the RAID drivers on floppy (and you have a floppy drive) you can try putting it in during the press F6 message.