In this moment I'm simply extracting the required font files to the Windows\FONTS -folder, and then my program opens the FONTS -folder for the user to see if the fonts are there.

Is there a way to install the fonts so that they work right away and absolutely 100% sure? Is it possible to run the "Install new font" -program with the chosen font automatically?

The method I'm using now usually works, but sometimes it doesn't. The font types are TrueType and "normal", and the number of fonts is 4 (unless my memory has been erased ).