Fatal error: Uncaught exception 'com_exception' with message 'Failed to create COM object `Excel.Application': Access is denied.

<?php
	$xlApp = new COM("Excel.Application");
	if($xlApp)
	{
		echo "Connect to Excel.Application";
	}
	else
	{
		echo "Can Not Connect to Excel.Application";
	}
?>

Fatal error: Uncaught exception 'com_exception' with message 'Failed to create COM object `Excel.Application': Access is denied.