Auto Open: Click on the link, wait for the download to finish in the download manager.
Manual Open: Right-click the link and click on "Save Link Target As". Navigate to the folder in which you wish to save the presentation and click "Save". Open the presentation from that folder.
Click the link. If you wish to open up the presentation inside the IE window, click "Open". If you wish to save the presentation on your hard drive, click "Save" and select the folder you wish to save it in. Open the presentation from that folder.
If you do not have Microsoft PowerPoint on your computer:
Click here to download Microsoft PowerPoint Viewer 2003. It's free and easy to install. Follow the instructions on the Microsoft website.