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2. Windows XP - Wikipedia

   en.wikipedia.org/wiki/Windows_XP

   The first, Windows XP 64-Bit Edition, was intended for IA-64 systems; as IA-64 usage declined on workstations in favor of AMD's x86-64 architecture, the Itanium edition was discontinued in January 2005. [57] A new 64-bit edition supporting the x86-64 architecture, called Windows XP Professional x64 Edition, was released in April 2005. [58]

3. Windows NT - Wikipedia

   en.wikipedia.org/wiki/Windows_NT

   While Windows 2000 only supports Intel IA-32 (32-bit), Windows XP, Server 2003, Server 2008 and Server 2008 R2 each have one edition dedicated to Itanium-based systems. [ 71 ] [ 72 ] [ 73 ] In comparison with Itanium, Microsoft adopted x64 on a greater scale: every version of Windows since Windows XP (which has a dedicated x64 edition ) [ 74 ...

4. Windows 7 - Wikipedia

   en.wikipedia.org/wiki/Windows_7

   Minimum hardware requirements for Windows 7 [127] Component Operating system architecture 32-bit 64-bit Processor: 1 GHz IA-32 processor Support for SSE2 required after March 2018 cumulative update [128] 1 GHz x86-64 processor Memory (RAM) 1 GB 2 GB Graphics card: DirectX 9 graphics processor with WDDM driver model 1.0 Storage space 16 GB 20 GB

5. Windows 11 - Wikipedia

   en.wikipedia.org/wiki/Windows_11

   Thus, Windows 11 is the first consumer version of Windows not to support 32-bit processors (although Windows Server 2008 R2 is the first version of Windows Server to not support them). [ 148 ] [ 149 ] The minimum RAM and storage requirements were also increased; Windows 11 now requires at least 4 GB of RAM and 64 GB of storage. [ 150 ]

6. UEFI - Wikipedia

   en.wikipedia.org/wiki/UEFI

   UEFI requires the firmware and operating system loader (or kernel) to be size-matched; that is, a 64-bit UEFI firmware implementation can load only a 64-bit operating system (OS) boot loader or kernel (unless the CSM-based legacy boot is used) and the same applies to 32-bit.

7. Criticism of Microsoft - Wikipedia

   en.wikipedia.org/wiki/Criticism_of_Microsoft

   Microsoft does not provide refunds for Windows licenses sold through an OEM, including licenses that come with the purchase of a computer or are pre-installed on a computer. [60] According to Microsoft's End-user license agreement for Windows 7 the ability to receive a refund for the operating system is determined by the hardware manufacturer: [61]