Site crashing during call to the MySQL dataase

Hello, I am using Drupal v4.6.3 with a MySQl database. I got the site up and running 3 weeks ago and everything was working great. However, last night I noticed that ALL of my blocks dissapeared and I had to do some creative navigation to get through my site to post forum topics. Finally, (an hour later) the entire site crashed. Leaving me with the following error on my index page:

"Fatal error: Call to undefined function: node_title_list() in /home/corey/public_html/modules/forum.module on line 354"

You can view it for yourself here: http://www.coreyhernandez.com

Besides some heavy posting on my part, the only recent change is I installed the mass mailer and phplist module 4 days ago (probably unrelated?). Before the entire site crashed, I could still navigate the site using the history tool in my browser. However, if I were to go to the block editing page I would get a blank screen (the only page that gave me a blank screen). Now I just get the error menioned above.

"Line 354" mentioned above refers to the following portion of code in the forum module:

   case 'view':
      if (user_access('access content')) {
        switch ($delta) {
          case 0:
            $title = t('Active forum topics');
            $sql = db_rewrite_sql("SELECT n.nid, n.title, l.last_comment_timestamp, l.comment_count FROM {node} n INNER JOIN {node_comment_statistics} l ON n.nid = l.nid WHERE n.status = 1 AND n.type='forum' ORDER BY l.last_comment_timestamp DESC");
            $result = db_query_range($sql, 0, variable_get('forum_block_num_0', '5'));
            if (db_num_rows($result)) {
              $content = node_title_list($result);
            }
            break;

"Line 354" is the $content = node_title_list($result); line.

With that in mind I figure that the problem is with the database. That's where I get stuck. Any suggestions? I obviously do not want to do a fresh install (which would probably solve the problem) and lose the last three weeks worth of posts.

Any assisatance you can offer would be greatly appreciated. Thank you.