I need help on installing Zen Cart

[MidwestComputer]

Hi Guys
I am a newbie on php and mysql and when I tryed to install Zen Cart on my website I get this error codes and here they are

Warning: fopen(c:/inetpub/wwwroot/zen-cart/v1.2.5/includes/configure.php): failed to open stream: Permission denied in c:\inetpub\wwwroot\zen-cart\v1.2.5\zc_install\includes\modules\pages\database_setup\header_php.php on line 79

Warning: fputs(): supplied argument is not a valid stream resource in c:\inetpub\wwwroot\zen-cart\v1.2.5\zc_install\includes\modules\pages\database_setup\header_php.php on line 80

Warning: fclose(): supplied argument is not a valid stream resource in c:\inetpub\wwwroot\zen-cart\v1.2.5\zc_install\includes\modules\pages\database_setup\header_php.php on line 81

Warning: fopen(c:/inetpub/wwwroot/zen-cart/v1.2.5/admin/includes/configure.php): failed to open stream: Permission denied in c:\inetpub\wwwroot\zen-cart\v1.2.5\zc_install\includes\modules\pages\database_setup\header_php.php on line 85

Warning: fputs(): supplied argument is not a valid stream resource in c:\inetpub\wwwroot\zen-cart\v1.2.5\zc_install\includes\modules\pages\database_setup\header_php.php on line 86

Warning: fclose(): supplied argument is not a valid stream resource in c:\inetpub\wwwroot\zen-cart\v1.2.5\zc_install\includes\modules\pages\database_setup\header_php.php on line 87


and here is in the php file

$fp = fopen($_GET['physical_path'] . '/includes/configure.php', 'w');
fputs($fp, $file_contents);
fclose($fp);
@chmod($_GET['physical_path'] . '/includes/configure.php', 0644);
// now Admin version:
require('includes/admin_configure.php');
$fp = fopen($_GET['physical_path'] . '/admin/includes/configure.php', 'w');
fputs($fp, $file_contents);
fclose($fp);