If you do not have Microsoft PowerPoint 2010 installed on your computer, you can still open and view PowerPoint presentations by using PowerPoint Viewer. PowerPoint Viewer is a free download from Microsoft.com.
You can open, view and print presentations using PowerPoint Viewer, but you cannot edit them. All transitions, videos and effects appear and behave the same when viewed using PowerPoint Viewer as they do when viewed in PowerPoint 2010.
PowerPoint Viewer supports opening and viewing presentations created in PowerPoint 97 and later versions.
PowerPoint Viewer opens supported presentation file types only if a version of PowerPoint is not installed on the PC that is being used. If PowerPoint is installed, it opens the presentation and PowerPoint Viewer is not used.
To install PowerPoint Viewer, download it for free from the Microsoft Download Center, and follow installation instructions on the download page.