If you're just learning, you don't need to mess around with virtualenvs; you can install Python via the official Windows installer and install packages globally. I don't feel like installing something is a very big initial hurdle to overcome, as opposed to having it be pre-installed (but potentially very outdated in the future).
On the contrary, installing something is the biggest hurdle after perhaps coming up with the idea that there's something here to be learned at all. And sometimes it's part of the latter.
