I have Windows 7 64-bit beta in my laptop, it runs smoothly. It's laggy sometimes, because my laptop isn't the best (see specs below). Better than Vista but still 10 years behind OS X.
Why Microsoft even brings that crappy 32-bit OS? All processors are 64-bit nowadays.
10 years behind OS X? Interesting, they fundamentally do the same tasks. Is Windows 7 too complicated for you? If anything, its the closest to OS X that its ever has been.
The processors that Apple uses support 64-bit, and yet they run a 32-bit system... MS runs a 32 bit os cause alot of people do not need a 64-bit system and thier software needs are still based on software that is only supported on 32-bit. Same goes for quad cores, waste of feakin time when your software is build to run on one core