You have to search for that tag on the comments.php file, or you can disable the comments from the single.php just look for the code comments_template() and replace that line with //comments_template()

That will deactivate comments function, if you want it back just remove the 2 slashes.

Or just open the database my PHPMyAdmin and delete comments from the WP_Comments table.

I still think the comment out "//" solution is the simplest... see reply #2.

thanks guys.

i removed the following code from comments.php and it worked:

<?php else : // this is displayed if there are no comments so far ?>

<?php if ('open' == $post->comment_status) : ?>
<!-- If comments are open, but there are no comments. -->

<?php else : // comments are closed ?>
<!-- If comments are closed. -->
<p class="nocomments"><?php _e('Comments are closed', 'default'); ?>.</p>

<?php endif; ?>

There's a plug in called "no comments on pages". That gets rid of every comment on every page.