novice question: I have a RasPi 2, running Kodi, connected via Ethernet to my router. I'd like to be able to access it through my windows laptop that's connected to the same network. How do I do that?
It sounds like you are attempting to access the files on your Raspberry Pi through your windows network. What you would likely need to do is turn on Samba on your PI, modify your firewall rules to make sure you aren't blocking access, and make the folders you want (likely the media folders) readable by all users.
The Kodi Wiki has a more detailed guide on how to do this in step by step fashion. http://kodi.wiki/view/Samba