How can I tell if my computer is running a 32-bit or a 64-bit version of Windows?
Windows 10 and Windows 8.1
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Select the Start button, then select Settings > System > About .
Open About settings -
At the right, under Device specifications, see System type.
Windows 7
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Select the Start button , right-click Computer, and then select Properties.
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Under System, see the system type.