I recently downloaded a font for a power point presentation. Will it definitely show up on a different computer ? Thanks(:

When you embed the font in the presentation, yes. Otherwise only if the font in question is installed on the other computer. Be aware that a great many fonts do not allow embedding in some form or at all.
What will be the result in your case is completely unpredictable as you carefully avoided to tell which font you are talking about. So you have to live with half an answer.
Good luck.