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If you are deciding between 32-bit and 64-bit, the x64 version offers significant advantages for specific hardware: BleepingComputer Windows XP x64 on modern PC - Bleeping Computer
Released on April 25, 2005, Windows XP Professional x64 Edition was specifically designed to utilize the expanded 64-bit memory provided by the x86-64 architecture. Unlike the standard 32-bit version, this edition is actually a modification of Windows Server 2003 windows xp iso file download 64 bit