How can I add or remove a screen saver?

I am using a Windows 2000 machine.I would like to know if there is a way that I can add or remove a screen saver, of my choice, from the drop down list in the Display Properties window. I can not seem to find where this folder lives.I am assumming that there is one somewhere.
If I click on the background tab, in the same window, I have a browse button were I am able to add the file of my choice to use as a background picture. No such button exsists for the screen saver tab. Would there be away to get to this folder so I can add or remove screen savers?