Only Bold appears in MS Word

This is a bit off topic, but I'm hoping someone here might be able to help.

There's this known issue with MS Office applications for Windows (as well as some other MS applications such as WordPad) where they sometimes show only one member from a font family. Just the Bold, for example.
Is there anything that can be done about it?
(I'm not asking how to avoid this problem when I create fonts of my own, but how to solve or overcome this problem with existing fonts.)
If there's no other way but to change metadata fields, what would be the safest way to change just what needed without touching anything else? I'm using Windows and I've got FL 5 (I can also install any freeware, of course).