Lets clear this thing up
YOU NEED A 64-bit prossor such as amd 64 3xxx+ or an intel 6xx series or above, to run windows pro 64-bit
there are curtly 3 virsions of windows XP HOME XP PRO and XP PRO -64-bit
i woulnt get windows pro 64-bit yet because of the lack of driver support and it slows down some 32 bit apps