If you need to install additional fonts, or just one, here is how to do it.

Open the Fonts folder from the Control Panel. Click on File in the top left-hand corner and select "Install New Font"

Browse to where you know you have the fonts stored and double-click on that folder. That will start the retrieval of font names. Choose the individual font you specifically require, or press Select All. Do remember that too many fonts on your system will slow the speed of your computer down. (See "Fonts - Uninstalling).

Make sure after selecting your font or fonts that there is a tick on the "Copy fonts to Fonts Folder" box, and then just press OK.