You're likely to have ongoing struggles with python 3 on Windows XP, as no currently supported versions of python 3 still support XP. Thus there likely won't be binary wheels for the older 3.x releases that support XP for any current versions of packages that include c extension code, and windows doesn't easily compile c code, so you'll have to get a compiler set up and working and be building your own cpython and/or extension modules (which seems untenable given it sounds like you have limited experience with python.)
I'm not certain about this... but if you absolutely must stick with XP, you might have better luck using a python 2 build for XP. Normally I wouldn't ever encourage someone to do that for anything new, but it may be the path of least resistance to support such old systems. (though be aware there are significant breaking changes between python 2 and 3, so you can't expect the same code to work on both.)