ok so i install snow leopard and whenever the legacy kernel is released would it be easier to "upgrade" in a way or would it be the same as starting over as if i never had mac os x on my pc?

Im gonna search for what i need to install but im completely new to this so if you have any other info, i would really appreciate it. and thanks for that bit you gave me. i appreciate that as well,

i thought 64 bit capable was compatible? It says 64 bit capable under the number of processor cores in the image.
thanks