As i knew that GD is available by default in XAMPP.
Check by making sure Apache is started then go to http://localhost/xampp/phpinfo.php and then look for the GD sections.
But when i go to the URL : http://localhost/xampp/phpinfo.php
It said the following, how to resolve it .
Object not found!
The requested URL was not found on this server. If you entered the URL manually please check your spelling and try again.
If you think this is a server error, please contact the webmaster.
Apache/2.2.11 (Win32) DAV/2 mod_ssl/2.2.11 OpenSSL/0.9.8i mod_autoindex_color PHP/5.2.8 mod_perl/2.0.4 Perl/v5.10.0