Should I download 64 bit or 32 bit?
Similarly one may ask, is my computer 32 bit or 64 bit?
Press and hold the Windows Key and the Pause key. In the System window, next to System type it will list 32-bit Operating System for a 32-bit version of Windows, and 64-bit Operating System if you're running the 64-bit version.
Subsequently, question is, should I install Python 32 bit or 64 bit? This is actually a fine choice: you don't need the 64-bit version even if you have 64-bit Windows, the 32-bit Python will work just fine. If you're running Windows XP: a complete guide to installing ActivePython is at Python on XP: 7 Minutes To "Hello World!".
In respect to this, should I install 32 or 64 bit software?
While it is possible to install a 32-bit operating system on a 64-bit system, it is best to install a 64-bit version if possible. The 64-bit OS will allow your computer to access more RAM, run applications more efficiently, and, in most cases, run both 32-bit and 64-bit programs.
Can a 64 bit run a 32bit program?
Yes, a 32 bit software can be run on a 64 bit Operating System. However, it is best recommended to use the 64 bit version if it is provided to you. EDIT: The 32 bit applications will be installed into the 'Program Files (x86)' folder in your System Partition.