With the development of 64 bits systems, hardwares, softwares, why the newest windows 8 still have 32 bits option ?? Considering that since 2003, virtually all x86 CPUs already have 64-bit instructions ??
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One case would be you only have 32-bit device drivers for some hardware you need. Maybe some telephony boards or industrial data acquisition and control. For the consumer, it's probably not likely you'll need the 32-bit version these days except maybe an old printer.