This is just a quick note-to-self to remind me of the stuff I always forget when installing plugins and the like for Vim on a Windows machine. So of course this means gVim. The confusing thing is always that the documentation for everything refers to your ~/.vim directory. And - you haven't got one. Here's the note to self.

Your ~/.vim directory is called vimfiles

And ~ is probably somewhere like C:\Users\dominic - your .vimrc will be there too, so you can find it by running vim and doing

:echo $MYVIMRC