Michael- It may be that XP is trying to substitute Courier or some other later all inclusive font for Roots Font. Have you played with the compatibility settings in XP? Another thought is that Windows metafile printer spooling might have some sort of interaction. You might try disabling that and selecting Raw.
I have no experience with Family Gathering and little with XP, but does FG permit export in RTF format to Word? If so, and if you use Word, the subject of Roots Font may be moot for most reports. John