1) download the 3 files to a folder on your hard drive
2) find the files on your computer and double click pngsetup.exe. This will extract the powerpoint presentation to the same folder.
3) You can use the viewer provided "ppview32.exe" in the folder to play the presentation by running ppview32.exe and choosing BEACHB1.PPT from the folder where you extracted files or, if you have Power Point on your computer you may double click BEACHB1.PPT and run it from there.