Font Navigator and Vista

I just upgraded my system. Unfortunately Windows 7 isn't out yet and I was not compelled to pay Dell another $100 for XP so I now have Windows Vista. I am experiencing some strange behavior in Font Navigator when I try to install certain Type 1 fonts which I never had a problem with on XP. I did a little experiment with three of them and installed them directly into the Vista Fonts. Now Font Navigator will install them. Those I did not install that way get the attached error message. Does this sound like a Font Navigator problem or Windows Vista?

All I can say so far about Vista is that it's pretty and relatively quiet compared to XP (system sounds). I now even leave my speakers turned on!