i am trying to install windows XP to my AAO 150 (xp-100gb), using an NLite SP3 slipstreamed CD, i have MACOSX working fine on it, system recovery won't work, but every time i try and install XP i cannot get past the serial number screen, i can't put a blank one in nor any of my 3 numbers all Purchased won't be accepted apart from using an illegal copy i'm stuck, i have performed many an install before and never had this problem i have tried 2 different discs Anyone help