Have you troubles on using JL-types' products?
Many people might not be familiar with font installation on Windows.
You can find font installation guide for Windows 7 and 8 on this Microsoft's page: http://www.microsoft.com/typography/TrueTypeInstall.mspx
Here are the instructions for Windows Vista: http://windows.microsoft.com/en-ZA/windows-vista/Install-or-uninstall-fonts
And here for Windows XP: http://support.microsoft.com/kb/314960/en-us
Hopefully these instructions help you.
If you have still problems, please go to our contact page. There is a message form, which you can use to describe you prolem and as for assistance.