No, it can't hurt your windows program.

Matmatic has nothing to do with rendering.

It's a program that reads scripts that people have made for shaders (Material room materials).  The program comes with the scripts.

Just install the program to your Poser runtime folder and follow the instructions as I posted above:

http://www.renderosity.com/mod/forumpro/showthread.php?thread_id=2635126&page=3#message_2999079

 

If you don't add anymore scripts that people have created, all you have to do is run the program one time. It will read the scripts and generate materials that you access through the material room and can apply to your items like floors and walls and all kinds of things.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi