How can I make the icons in the Notification Area on the Taskbar bigger?


A visually impaired family member finds the icons (e.g. Volume Control) in the Notification Area of the Taskbar far too small for her. How can I make these icons bigger? I have tried the “old” trick of “unlocking” the Taskbar and turning on the Quick Launch bar. Then, I click on the Quick Launch bar, click on “View” and finally “Large Icons”. The Taskbar gets bigger but the icons in question stay the same size. Anyone know a better way? Any help given is greatly appreciated.