To play any of these slideshows you need to download the "Presenter" Player, similar to the Flash Player, except the Presenter files are 1/4 the Flash player size . Anyway, the player is simple to install, and only needs to be installed once, just like the Flash Player.
When you click on a slideshow the first time it will know you don't have the player and will offer to download it. Just download pxsetup.exe file to your "desktop", then find it on your desktop and double click on it to install it (note: install it as administrator). That is all there is to it. Now click on any slideshow to see it.