Pari-Distributed has fairly few requirements. Although I only have the time/resources to test it on Linux, it should (hypothetically) run on Windows or other OSes with little to no modification. Please see the Usage Section for how to use Pari-Distributed once you've got the necessary components.
To download Pari-Distributed itself, I recommend you access the project's CVS. You can either manually download the four files you need using your web browser to access the project's CVS Repository , or if you have cvs installed, you can download the project with one command, e.g.
Pari-Distributed is free software, distributed under the GNU Public License, Version 2.0 or later.