Well here is an idea not for the faint of heart whatever that means:
edit the default .msstyle with a tool like skin studio professional, which has a search and replace function, where u can search on FONTS and see all being used. Then change them all to Tahoma. warning: personally i have done this with other styles created by folks here (i liked some aspects of the style, but not the font ie. dungeon) but i noticed that some of the font changes do not take effect until after a reboot or two. Anyway, once the style is edited u can load your new style with a tool like windowblinds. It's a lotta fun!
good luck,
jigs