Simply select the screensaver according to your operating system (OS) and double click install.
After a moment, a dialogue box will appear and ask if you want to :
Run this program, or Save it to disc.
Select Run this program.
Answer yes, ok, next or extract to any other dialogue boxes, some of which may appear behind this window, use Alt and tab together to switch between windows.
The screensavers will automatically extract themselves to the relevant folder.
Once installed you will be offered the chance to preview the screensaver, (not XP).
To use it, select it in the Control Panel / display / screensaver/ chapel.