Changing Font Size in Explorer Toolbar and Taskbar

You can change the fonts of individual parts of the skin through Windowblinds 7.  There is a tab called fonts in the config window and there is a slider there to increase or decrease the font size, but that will change the font size of the whole skin.  In order to change the font size of just the taskbar, etc., you will need to do that through Skin Studio.

Thanks, but how do I edit the current Aero theme in Skin Studio? I don't see any option to do this.

If you are talking about the default Aero theme that comes with the OS, you can't edit it in Skin Studio.