sidebar conflicting with single.php

Hi,

this is sidebar.php

<?php query_posts(‘category_name=News&showposts=5’); ?>
<?php if (have_posts()) : while (have_posts()) : the_post(); ?>

<div class=”sidebar_news”>

<p class=”date”><?php the_date(); ?></p>

<h2>“><?php the_title(); ?></h2>

</div> <!– SIDEBAR NEWS–>

<?php endwhile; ?>
<?php endif; ?>

<?php if (function_exists(‘dynamic_sidebar’) && dynamic_sidebar(‘Sidebar Widgets’)) : else : ?>

<!– All this stuff in here only shows up if you DON’T have any widgets active in this zone –>

<?php endif; ?>

and this is single.php

<?php get_header(); ?>

<?php /*?>
// disable the sidebar and it works
<?php get_sidebar(); ?>
<?php */?>

<div id=”content”>

<?php /*?>
<?php reset_query(); ?>
<?php */?>

<?php while ( have_posts() ) : the_post(); ?>

<?php get_template_part( ‘content’, get_post_format() ); ?>

<h2 id=”post-title”><?php the_title(); ?></h2>

<?php the_content(); ?>

</div>

<?php endwhile; // end of the loop. ?>

<?php get_footer(); ?>

If i enable the sidebar the post is always the newest, not the correct id.
Any idea how to solve this??

thank you!