Set Accessibility features for people who are blind or who have low vision in Windows XP

The Start menu Accessibility programs
The Start menu contains visual enhancement utilities that you can select.

To use the Accessibility program, follow these steps:
Click Start, point to All Programs, point to Accessories, and then click Accessibility.
Select one of the following features:
Magnifier
With this feature, you can enlarge the screen display.
Narrator
This feature provides audio assistance about the items that are displayed on the screen.

Get more detail from here.....