HiDiannSchroeder**,**
1. Are using the CTRL key + mouse wheel scroll? 2. What is the make and model of the mouse?
If you use CTRL key + mouse wheel scroll then the text size will change on the desktop. Actually the zoom changes on the screen if you use the keys.
You may check that if the text size comes to normal if you right click on the desktop and select the option view – small icons or any other icon size.
Hope this helps.