If you decide to use different fonts in presentation you have to assume  other computers won’t have them installed.. so embed them.
Here is the HowTo:

1. Click the Office Button
2. Click Word/PowerPoint Options (bottom of the menu)
3. Click the Save feature at the left pane
4. Under the Preserve fidelity when sharing this document section
5. Check Embed fonts in file and Embed only the characters used in the document options
6. Click OK
7. Save the documen