Having font trouble creating utf files

Hello all,

Im having trouble with creating the .utf files for my game. Previously I had it working by following the tutorial on re-sizing GUI resolutions/fonts on this page:
http://tdn.garagegames.com/wiki/Torque_2D/StandardTutorials/Basics/GuiResolution

This created my fonts properly in the right sizes by using the populate fonts function. However, on testing it's been found that the font we have isn't very clear so i've been trying to change it but without any luck! All the fonts we have are Truetype fonts (.TTF) but when it's creating the font it didn't seem to be the right size. On testing nothing appeared. I then tried to create the old one back again (the one which worked previously) and this again created at a smaller size and doesn't work.

Is there any other way that anyone uses to create their uft fonts?
I've also been told that the fonts don't work on Vista too.