For windows XP:
1. Open Fonts in Control Panel.
2. On the File menu, click Install New Font.
3. In Drives, click the drive you want.
4. In Folders, double-click the folder that contains the fonts you want to add.
5. In List of fonts, click the font you want to add, and then click OK.
To add all of the listed fonts, click Select All, and then click OK.