64-bit Windows

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64-bit Windows is a version of Windows by Microsoft that uses 64 bits of data to be processed in parallel and can handle more than 4 GB of system RAM.

Windows XP, Vista, 7, and 8 all have 64-bit versions.

64 bit versions of Windows are not backwards compatible with 16-bit software (anything that would run on the MS-DOS or Windows 1.0/2.0/3.x operating systems), though they are able to run over 99% of all 32-bit programs, though hardware drivers need 64-bit versions to function.

16-bit software can be made to run only through an emulation mode (such as Windows 7's "XP Mode") or virtual machine program that runs a virtual copy of another OS and recreates it's capabilities while running a 64-bit OS.

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