The 64 bitarchitecture has been around for a while but the need to utilize and improve it was when more browsers and applications such as games and work related applications needed more ram. 3 Gigs became not enough and expanding more ram to the home user allowed Windows pcs to do more and not be bogged down.
Processors will not operate (including 32-bit operation) without an Intel 64 architecture-enabled BIOS. Performance will vary depending on hardware and software configurations.
Though he could not read their hieroglyphic script, Evans was convinced by the remains of their art and architecture that the Minoans were every bit as brilliant and sophisticated as the classical Greeks.