Enphenitie

I used to have three hard drives. Two 120 Satas, not in an array, but separate, and a 160 IDE, at one point in time I would get that error you see in the topic name, and simply putting in my windows cd and restarting would fix my problem, although I would have to choose between my non-existing former windows home, and the current installation of windows pro. One of the 120s just kind of.. died, and it had my windows on it, so I reinstalled, and everything worked fine, no longer had to have my windows cd in, but was still selecting between a non-existing windows, now the old windows pro, and my current windows pro. Now, I have purchased a 300gig IDE, and everything works just fine except for the fact that I now get the error again, and cannot boot from the CD at all to try to fix anything. Help, anyone?