Rozdíl je 32 bitů.
Google: 64-32
http://pc.poradna.net/question/view/146677-jaky-je- rozdil-mezi-32bit-a-64bit-wxp
http://pc.poradna.net/question/view/118656-zvolit-6 4bitovou-nebo-32bitovou-verzi-vista
http://pc.poradna.net/question/view/97130-windows-x p-64bit
http://pc.poradna.net/question/view/41806-do-budouc na-32-vs-64-bit-hardware-os