To see Persian Fonts:

1) You should use IE (Internet Explorer) ver 5.0 or later. Unfortunately Netscape doesn't support this Farsi script
2) Go to Menu of IE, click on View and Encoding.
3) Set the Encoding on UNICODE (UTF-8)
4) If the Auto Select (in the same window) is on, click on it to be off (You shouldn't see checkmark beside it)
5) If you use Farsi Tools like Parsa, most probably you can't see the text. You have to uninstall it from your computer...