NetExporer require the use of PHP5 . You should check with your web host if your server runs on a version of PHP greater than or equal to version 5.
To check the version of PHP on your Joomla installation, go to:
Joomla -> Help -> System Info and check the "PHP version".
The use of the component need that ionCube is installed on your server, if it is not the case you can always install it here : ionCube Loaders.
Before installation, choose the file for your platform.
Install it, then activate it by inserting at the end of php.ini this line:
zend_extension = "...install_directory.../ioncube_loader_win_5.3.dll"
To check that it is installed, go to: Joomla -> Help -> System Info -> PHP Information