This is a tough one to decipher. Your first sentence has me stumped. So,
let's move on to sentence two. Basically this is an odd question. You don't
just by a "64 bit chip". If you really want to run the 64 bit version of XP
you have to run it on a system built to support an Itanium processor. Do you
have such a system? Anyway, the 64 bit XP is separately licensed. Why?
Because the publisher spent jillions of dollars developing it and they want
to recover their costs and maybe make a few bucks as well. As far as I can
tell from the MS site this version of XP is only available from 64bit system
manufacturers.
cp