lol this is what i had to go through when I upgraded my comp. I wanted my new maxtor drive to be the bootup drive and the IBM to by my storage. But my IBM was already C:\ so my maxtor became like F:\ or soemthin cause i had two other opticals. I just changed my IBM from C to G, and reformated my Maxtor. Then installed windows and since C was now free, it automatically grabbed the drive letter.