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The main differences between 32-bit and 64-bit versions of Windows are:

  • 32-bit versions of Windows can access a maximum of 4 GB of RAM (with the exception of Windows Server, which can use PAE). 64-bit versions have a theoretical maximum of 144 petabytes, and a real-world limit of 2 terabytes
  • 32-bit versions of Windows cannot run 64-bit programs
  • 64-bit versions of Windows cannot run 16-bit programs

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