From XP HELP...
[[If you want to increase the size of text on your screen to make it more
readable, use Font size on the Appearance tab in Display Properties.
Open Display in Control Panel.
On the Appearance tab, in Font size, click a new font size.
Notes
To open Display, click Start, point to Settings, click Control Panel, and
then double-click Display.
This option enables you to enlarge the fonts used in window headers, icon
labels, and menus. For information about enlarging all items on your screen,
click Related Topics.
The font size options are based on the current theme, visual style, and
color scheme. For some themes, styles, or schemes, you may only have one
font size option. ]]
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To increase or decrease the size of objects and text on your screen
[[To open Display, click Start, point to Settings, click Control Panel, and
then double-click Display.
On the Settings tab, click Advanced.
On the General tab, in the DPI setting list, click the dots per inch (dpi)
setting you want to use.
If you choose Other in the DPI setting list, you can set custom options in
the Custom DPI Setting dialog box either by selecting one of the percentage
options in the drop-down list or by clicking on the ruler and dragging the
pointer to specify a setting.
Restart your computer when prompted. ]]