Assuming you are running Windows 7, right click on an empty area of your screen. Choose personalize from the menu. In the tower right of the new window, there is a link to "display". Click it and then try the Medium setting first, and then the large one if that isn't enough. But be aware that this will change how some web pages display, especially ones that ask you to click on a box or write in a small box. You might have to switch back to smaller type to do that. I run my flat screen on Medium, which has type size 125% of normal. It seems to be the best compromise between size and distortion for me. With the "larger" (150%) setting, you sometimes miss stuff on web pages.
If you have a lot of time to experiment, and enjoy doing so, you acan also click the link for "Window color" in the middle bottom of the Personalization page, then click the "advanced appearance settings". The window that opens there has a drop down menu that will let you change typesides and fonts, as well as changes spacings for individual parts of the windows. It takes a lot of patience, though, because you have to guess at what it is you are actually changing a lot of the time, as the descriptions are not always straight forward.
You can do more or less the the same thing in Windows XP.
