Here you will find a guide for installing the Koha Integrated Library System ( http://koha-community.org/) on an existing windows/mac/linux system. Although the newest version of Koha is only available for debian linux, it is possible to run a linux virtual machine on another system.
This guide outlines two options to install. The first option is to install using a pre-made image of the Koha server. The second option is to install from scratch.
You can find a link to the guide below.
If you find the guide useful, please let me know.