If it is because they are too small, try lowering the resolution. When you run the desktop at a high resolution it will have the ability to display a large amount on screen at once but it will be small. When you run it at a lower resolution it will be able to display less on screen at one time but what it does show will be displayed larger (text and icons etcetera). I have had to do the same with my desktop.
Ps. I do not own windows 7 or 8 so if they have other options I cannot help.