I had this problem ones and i think i remember how i fixed it. I have a Norwegian Windows so i can't give you the exact names but this is approximately what you have to do. Right click on an empty space on the windows desktop and select the lowest option in the drop down menu, click on the 'header menus' till you have a screen with an image of different menus and boxes (3. from the left on my Windows). Click on the text you want to change the font for and select a new font. Then click on the apply button and you are done.