It is true that you have to be careful deleting fonts from your computer as
you can change the way the various programs display data on the screen.
To reduce the number of fonts in the Windows/Fonts folder I copy all the
fonts from that folder to another one as a backup. Create a Backupfonts
folder somewhere on a hard drive. Start Windows Explorer and navigate to
C:\Windows\Fonts (you have to have the view hidden files turned on and you
should also have show extension for know file type turned on) Single click
on any font in the folder and then press the Ctrl key down and hold it while
you tap the A key once. After a while all the fonts will be selected
(Change to blue background). Press the Ctrl key while pressing the C key.
This will copy all files to the clipboard. Navigate to the Backupfonts
folder and press the Ctrl key and the V key. This will cause all the fonts
to be copied to the Backupfonts folder.
Once that is done you can safely delete some fonts from the fonts folder in
Windows. If a problem develops you can reinstall the font.
Don't delete the following groups of fonts however as they are needed by
Windows to function properly. All fonts with a FON extension as these are
always system fonts. The additional fonts not to delete are: Arial, Book
Antiqua, Century gothic, Courier, Tahoma, Times New Roman, Trebuchet,
Univers, Verdana, and Wingdings
You can go to
http://www.microsoft.com/typography/fonts/product.aspx?PID=135
to see the list of fonts supplied with XP