First to let everyone know if you want windows 64-bit go to microsoft.com they will let you download it and they send you a seiral number.
I just upgraded to a giga-byte GA-K8NS mobo with Athlon 64 2800+.
i downloaded xp 64-bit from microsoft, I had problems finding drivers for the ethernet and sound, so I went back to xp pro. If anyone know where to get them or has any help all will be thanked