Are the icons and writing on your computer screen too small, or to large?
You need to change the resolution of your screen.
Resolution means how many pixels can fit into your screen. You have probably heard of or read somewhere numbers like 800×600 or 1024×768 or something like that. Those numbers are the resolution of the screen.
To change the resolution (in Windows XP), right-click on an empty area of the Desktop and click on Properties.
Then click on the Settings tab, and down at the bottom left, there will be a slider which will alow you to change your screens resolution.
When you are finished, click on Apply and then OK.
The screen will go black for a moment, and the re-appear in its new size. When it does, there will be a Dialog Box asking if you want to keep the new resolution. If you are happy with it, click yes.