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Both are impossible. An 80486 is far below the minimum requirements for Windows XP, and lacks certain instructions used by Windows XP that are only found in Pentiums and later. Examples include CMPXCHG8B, CPUID, and CMOV. The last version of Windows to officially support the 486 was Windows NT 4 and Windows 98. Windows ME and 2000 could be shoehorned onto it, but it ran extremely poorly.

64-bit versions of XP only run on 64-bit processors, such as the Core 2 Duo or AMD Athlon 64. The 80486 is a 32-bit processor, so even if the above were not true, you couldn't run the 64-bit version.

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Q: You have an 80486 computer and need to install either Windows XP 64-bit or 32-bit. Which one is best and why?
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