http://www.apcstart.com/site/dwarne/200 ... 2bit-vista
Microsoft revealed today that no 32-bit versions of Windows Vista will be able to play back “next generation high definition protected content” (translation – studio-released BluRay and HD-DVD movies).
By far the majority of PCs use 32-bit processors, because despite AMD’s efforts to push 64-bit CPUs into the marketplace early, Intel’s first widely-promoted 64-bit CPU is the just-released Core 2 Duo.
PC users will now have to choose between a PC that can play high definition content (64 bit) versus one that can potentially run older devices that only have unsigned drivers available (32 bit).