The quickest & simplest way to change the size of your text is to hold down Ctrl (found on the bottom left of your keyboard) and roll the scroll wheel (located bewteen the two buttons) on your mouse.
Alternatively, you can hold down Ctrl & press the plus (+) key to enlarge or the minus (-) to shrink.
If this does not work then please select, View, Text Size and select one of the options to make the text smaller or larger.
It may also help if you change your screen resolution. Depending on your Monitor you may find that changing your screen resolution helps you.
Reading an article from microsoft found here, about screen resolution may help you. This link will open in a new window.