Microsoft gives you the 32-bit version of Windows 10 if you upgrade from the 32-bit version of Windows 7 or 8.1. But you can switch to the 64-bit version, assuming your hardware supports it. If you had a 32-bit versions of Windows 7 or 8.1 installed on your PC and upgraded to Windows 10, Microsoft gave you the 32-bit version of Windows 10.
Is Your PC 64-bit Capable? - First thing’s first, you’ll need to confirm whether the CPU in your computer is 64-bit capable. To do so, open the Settings app from your Start menu, select System, and select About. Look to the right of “System type.”
If you see “32-bit operating system, x64-based processor,” this means you’re using a 32-bit version of Windows 10 but your CPU can run a 64-bit version. If it doesn’t say you have an x64-based processor, you have a 32-bit CPU and can’t upgrade to the 64-bit version.