If in doubt, always get the 32-bit version.
32-bit and 64-bit are a technical shorthand for describing how much memory can be accessed by a computer processor (CPU) or program.
64-bit operating systems and programs can access more memory than their 32-bit counterparts, which can improve performance.
We can say that:
To find out if you are running a 32-bit or 64-bit version of Windows: