Yeah, his HDD and DVD drives are IDE. But I don't know if I have another copy of the operating system, the copy of XP home he has came with his current system. That's why I wanted to use the HDD, I don't know if the installation disk will work in his new computer. Meaning I wouldn't be able to do a fresh install of XP on his new computer... Make sense?
I'm not too bothered if he looses XP Home, but it would be good if he could keep it, because he is used to it...