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  2. How to upgrade from 32-bit to 64-bit version of Windows 10 - AOL

    www.aol.com/news/upgrade-32-bit-64-bit-212659036...

    In this guide, we'll show you the proper steps to upgrade from the 32-bit to the 64-bit version of Windows 10 without purchasing a new license. ... Windows 10 64-bit download. Click the Next button.

  3. Windows on Windows - Wikipedia

    en.wikipedia.org/wiki/Windows_on_Windows

    Many 16-bit Windows legacy programs can run without changes on newer 32-bit editions of Windows. The reason designers made this possible was to allow software developers time to remedy their software during the industry transition from Windows 3.1 to Windows 95 and later, without restricting the ability for the operating system to be upgraded to a current version before all programs used by a ...

  4. 3 GB barrier - Wikipedia

    en.wikipedia.org/wiki/3_GB_barrier

    Many 32-bit computers have 32 physical address bits and are thus limited to 4 GiB (2 32 words) of memory. [3] [4] x86 processors prior to the Pentium Pro have 32 or fewer physical address bits; however, most x86 processors since the Pentium Pro, which was first sold in 1995, have the Physical Address Extension (PAE) mechanism, [5]: 445 which allows addressing up to 64 GiB (2 36 words) of memory.

  5. 64-bit computing - Wikipedia

    en.wikipedia.org/wiki/64-bit_computing

    However, most 32-bit applications will work well. 64-bit users are forced to install a virtual machine of a 16- or 32-bit operating system to run 16-bit applications or use one of the alternatives for NTVDM. [41] Mac OS X 10.4 "Tiger" and Mac OS X 10.5 "Leopard" had only a 32-bit kernel, but they can run 64-bit user-mode code on 64-bit processors.