I have the same problem and I can not find a solution doing the above my system is windows 10 64bit. Was a solution found?
It is definitely a solvable problem, though we never heard back from the original poster in this thread. Which version and build of Band-in-a-Box do you have?
There are several PG Music fonts. One is called pgmus.ttf. The name of this font is PGMusic F Regular.
Can you please tell us if you see this font when you navigate to the fonts folder in Windows Explorer? (C:\Windows\Fonts). A screenshot would be great.