getting a new A64 rig, I know MS released windows xp 64bit, which you can get for free, and use it for a year. So, what happens when that year passes? and besides, how does win-64 preform, i.e. is there any performance gain, if yes, then where? (games, desktop apps. etc.), and offcourse what's the bottom line, use win-64 or just install the "regular" (32-bit) xp-pro I own?