Try this, if you have not finished up the 30 days trial. Reinstall WB. apply a skin. Once that is done. Reboot. Than once reboot done. Open WB and change Skin to Default Windows skin. Reboot. Once reboot is done, check if all the font has return to default. Once that is okay. Uninstall WB. Reboot again to make sure everything is back to default Windows.

Thank you,
Basj,
Stardock Community Assistant