How to Change the Default Fonts in Windows 7
This will show you how to change most or all of the default fonts in Windows 7 for Active Title Bar, Icon, Inactive Title Bar, Menu, Message Box, Palette Title, Selected Items, ToolTip, and various Dialog Box text and buttons.
:warn:Changing a Windows 7 font doesn't change your program fonts.
For a list of all default fonts that come supplied with Windows 7, see: Fonts supplied with Windows 7
Through Advanced Appearance Settings
This will let you change the default font, font size, and font color for the Active Title Bar, Icon, Inactive Title Bar, Menu, Message Box, Palette Title, Selected Items, and ToolTip text. See this link under step 8 there for the default Advanced Appearance...