If you're curious to learn more about the fonts on your Windows XP machine, there's a free and handy extension that will give you the scoop. It also helps you see which fonts are already on your machine.
The Fonts folder, located in the Control Panel, provides a number of features you can use to keep track of the fonts installed on your Windows XP system. For example, on the View menu, you'll find the the List Fonts By Similarity command, which gives you a unique way to organize your fonts, and the Hide Variations command, which makes it easier to quickly discern available fonts by showing only one font from each family.
If you want to add more features to the Fonts folder, you can download the newest version (2.30) of the Font properties extension from Microsoft's typography page
After you download and install this extension, the number of tabs on each font's properties dialog box will jump from two to 11, with each tab providing all kinds of information about the font. The information contained on these 11 tabs includes very detailed descriptions of each font, links to the font vendors and font designers, legal information, such as ownership, copyright, trademark, license, and embedding permissions, as well as technical information about the font.