How to Determine if a Computer Is Running a 32-bit or 64-bit Version of Windows
Summary:This article discusses how to determine what type of Windows operating system is installed on your computer.
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Click Start, type system in the box, and then click System in the Programs list.
In the System window, note the system information that appears in the following section: System Type: Identifies whether a 32-bit or 64-bit version of Windows 10, Windows 8.1, Windows 7, or Windows Vista is installed on the computer as follows: