You might have weekly spelling words, daily items to remember, times tables charts or a picture of the solar system or something relevant to what you are studying.  These can easily be created in PowerPoint and then converted into a screensaver to be displayed on your interactive white-board or classroom computers.  It is as simple as following these steps below.  

1. Open the presentation, you want to make it appear as a Screensaver.
2. Go to File menu > Save As > Browse through the window to an Empty folder, or simply create one.
3. Select Device Independent Bitmap from the Save as type drop-down box.
4. Type the name of the new document in the field represented byFile Name, and click on the Save button.
5. Now right-click on the Desktop, and select Properties.
6. Go to Screensaver tab, and select My Pictures Slideshow from the drop-down box, at the left of 'Settings' button.
7. Click on the Settings button, and a window will appear. Change the source of the screensavers, by clicking on the Browse button, and selecting the previously created folder.
8. Change other settings, if you want, and click on OK.
9. Leave the computer inactive, so a brand-new Screensaver version of your Powerpoint presentation appears.