To apply a template you’ve downloaded to your existing presentation:

This will apply the downloaded template to your existing presentation.Alternately, you can save the template in the default Microsoft PowerPoint Themes folder. This will display the template in the “Themes” panel along with the other built-in templates/themes.

Open the downloaded template

1. Click on the “Office Button”, scroll down to “Save As” and choose “Other Formats” from the submenu. This will open the “Save as” dialog box
2. By default it should take you to the default Microsoft PowerPoint Themes folder. Otherwise, locate the folder. It should be in:
   (Windows Vista) C:\Users\UserName\AppData\Roaming\Microsoft\Templates\Document Themes(Windows XP)C:\Documents and Settings\UserName\Application Data\Microsoft\Templates\Document Themes
3. Choose the file name, choose “PowerPoint Template” in the “Save as type” dropdown format list and save.This will display the template in the “Themes” Panel under the “Design” tab. You can also browse for the theme under “My Templates” when you open a new presentation.

Some of the great presenatation templates for different fields can be found behind the following links: