iPhone: Minimum system requirements
64-bit editions of Windows are not supported
A big bummer for any windows users who decided to install a 64-bit version of Windows XP or Vista to take advantage of their 64 bit processor, and the option of using more than 3GB of memory. You know, “early” adopter types, the same sort of people who might buy a $599 phone and put up with a number of missing features and being tethered to a particularly unloved mobile carrier with an anemic 2.5 G network because they saw the vast potential of the thing
that sux yo. why not 64 bit? I have 64 bit OD and I am having problem with it.