Click on the size screen saver beneath the one you have chosen.

A dialogue box will appear asking if you wish to open or save the file you have selected - click "save" and choose a directory to save it to.

Use Winzip or another file compression program to unzip the file to a directory of your choice.

Go to the directory where you have unzipped the file and run the screensaver setup file by double clicking on it.

A dialogue box will appear, click on "accept and install".

When the install is complete, your Display Properties window will appear - click OK to finish.