The font used within ArrayStar is controlled by your Windows font settings for the "message box" item. To adjust these settings:
On Windows 7 and Windows 8:
1) Open the Control Panel.
2) Use the View by drop-down menu to view items by Small icons or Large icons.
3) Click on Fonts.
4) Using the links on the left, change the font settings and size to suit your preferences.
5) After making each change, click Apply.
Your new font settings should now be reflected in ArrayStar.