I have an AMD Athlon X2 64 bit processor currently running xp pro 32 bit and would like to upgrade to 64 bit xp pro to take advantage of the extra RAM and HDD space I cannot currently utilize. My computer is an ACER Aspire and their support site is not user friendly to locate non-factory installed drivers for other bit OS. It shipped with Vista HP 32 bit, but being a midrange system, it creeped along. Anyone that could point me in the right direction please??