The fonts are present in the menubar of program main window, in the settings dialog and in the about dialog, but they are missing in the main window elements like expandable panels. Installing mscorefonts and ms tahoma and substituting them with the subsequent reboot doesn't help for me. In w2k3 the fonts in the program are displayed correctly. The difference is visible on screenshots.
Testen with gf88d029 (0.4.10-dev-117).
Don't forget to disable all third-party additional programs from Yandex during setup to avoid clogging of the system!