Microsoft Windowscomes in two flavors: 64-bit and 32-bit. Only 32-bit versions of Windows can be operated on 32-bit CPUs. 64-bit CPUs, on the other hand, may execute both 64-bit and 32-bit versions.

1. Determine if Windows Vista, 7, 8, or 10 are 32-bit or 64-bit operating systems.
2. Hold down the Windows and Pause keys at the same time.
3. If you're running a 32-bit version of Windows, the System window lists 32-bit Operating System next to System type, and 64-bit Operating System if you're running a 64-bit version.

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