Find out if the notation font is in fact installed. There are several PG Music fonts, one of which is pgmus.ttf (PGMusic F Regular), and this needs to be installed to view notation properly. The BB program installer installs the fonts, or you can run bb\Data\Installers\bbfonts.exe. It doesn't matter if the Band-in-a-Box program is installed on your D: drive or wherever.
I suggest:
1. Reboot your PC.
2. Run the font installer again.
Now, check to see if the problem is fixed. If not, take a look in the Windows fonts folder:
A - Check the C:\Windows\Fonts folder to see if the font is there. The Fonts folder is "special" in that it shows you the title of the fonts installed (PGMusic F Regular), but doesn't show you the individual files present.
B - You can look "under the hood" at the actual files in the Fonts folder. You can get there the following way. Type this into Explorer:
\\localhost\C$\Windows\Fonts
Let us know what you find.