Could not load the following font issue in ireports

Question

We have our own fonts for our application. We are using Windows Vista operating system to develop the Reports using iReport. We are using iReports 3.7.1.

I kept all my fonts in a folder in C:\ drive. I gave fonts path in iReport. Still I am getting 'Could not load the font' error while generating the report.

The same worked fine on Windows 2000 and with iReport 2.x versions.