Go to your desktop, right click and select "Properties"Go to the "Appearance" tab. Go to "Font size" at the bottom section and select "small" or "normal"
There is a much easier and better solution, by using the Default Text Styling glabs feature, using which you can set the default font type, size and color very easily. Follow the steps mentioned in...
You can just google this: "How to make hearts on AIM", and click on one of the yahoo answers and copy the hearts and paste them in your convo on AIM. It might sound confusing, but it actually works....