I can think of two possibilities (there are probably more).
Click on "start" then click on "display" icon and select "settings" tab. You will see "screen area". Moving the pointer to the left will mean larger display and to the right will mean smaller.
Secondly, If you depress the Ctrl key and roll the wheel on your mouse it will change the size of the display. In fact, try it now while you are on this page.
Let us know if this solves the problem. If it doesn't I am sure there are others here who can help.
The little people are at it again. Everything is getting smaller and smaller, even when I use the full screen it doesn't max out to full screen and I can hardly see the mouse pointer or read anything. Using Windows 98 on Gateway. Thanks vi