fatal error call undefined function get_header

I downloaded at template (Elite from THAT Agency) and began to customize using Dreamweaver CS5. All was going smooth until I opened DW again and can no longer view index.php in Live View. I have read many forums and followed troubleshooting steps mapped out for others with simular issues and problem is still not resolved. Any help would be greatly appreciated…I’m obviously missing something.
Thanks!

Error Notice: Fatal error: Call to undefined function get_header() in C:\wamp\www\sitename\blog\wp-content\themes\sitename\index.php on line 1

Code from lines 1-10 from my index.php file:

<?php get_header() ; ?>

<div class="container_16 contentWrapper">
	<div class="grid_4 sideBox">
    	<div class="padder">
    		<!-- begin sidebar left -->
            <?php include (TEMPLATEPATH . '/sidebar1.php'); ?>
            <!-- end sidebar left -->