Enlarge Your Screen with the Microsoft Magnifier

Windows XP users who need a little bit of help seeing parts of the screen can use the Microsoft Magnifier, a built-in accessibility feature.
Magnifier is a display utility that makes the computer screen more readable by people who have low vision by creating a separate window that displays a magnified portion of the screen. Magnifier provides a minimum level of functionality for people who have slight visual impairments.
To turn on the Magnifier:

1. Click the Start button.
2. Click "All Programs".
3. Click "Accessories."
4. Click "Accessibility".
5. Click "magnifier".Set the level of magification and other options as desired.

Obviously, this is not intended to be a substitute for chronic visual issues, but it's a nice interim stopgap.

Click this link to view the Microsoft Magnifier documentation direct from the Microsoft website.