Hi Hacku69,
What are you trying to do exactly ? (you are confusing me)
It's as simple as explained above. Or you try to perform a repair install on your previous HD with the proper Windows CD (the one you used to install Windows on it before, NOT ANOTHER Windows disk), or, you make a fresh install on another HD with your own Windows disk, letting the other drive as slave.
Using your brother's Windows disk is not recommended (and is considered piracy). You must use your own.
If your hard drives are not hooked and jumpered properly as master and slave, you'll neve manage to do anything.
CD key has always the proper size. I think you are reading another number
Chris
Raining heavily here with thunderstorms/lightnings, so I need to quit for a while. Will come back later.