To show the News item slideshow block you have several options:
The first two options are described here:
Place the News item slideshow in a region of your theme

Place the News item slideshow in a Node
Important: It is important to enable the PHP filter module, to allow embedded PHP code/snippets to be evaluated.
<?php $block = module_invoke('views', 'block', 'view','[VIEWS_BLOCK_NAME]'); print $block['content']; ?>
<?php $block = module_invoke('views', 'block', 'view','news_items-block_1'); print $block['content']; ?>
Note: If you use the default news_items view the code above works fine and you dont need to change the views block name at all.
You can find the name of the views block when you hover on the configure link in the block administration page.

Comments
Instead of module_invoke you
Instead of module_invoke you can also use:
views_embed_view( 'your-view-name-here', 'block_1-or-similar' );
nice thing is that it allows to pass additional arguments as in:
views_embed_view( 'your-view-name-here', 'block_1-or-similar', $nid );
http://drupalcontrib.org/api/function/views_embed_view/6