saving plugin options – settings_fields()

I’m trying to save some plug-in options with no luck. First, the option is not even being added with the default and when I click save it just takes me to options.php. Any idea what I’m missing?

add_action("admin_init","tvc_globals_init");
   function tvc_globals_init(){
    register_setting("tvc_globals", "tvc_global_main");
    }
  register_activation_hook( __FILE__, 'tvc_globals_activate' );
  function tvc_globals_activate(){
    add_option("tvc_global_main", "my_default");
    }
  add_action('admin_menu', 'tvcweb_admin_actions');
  function tvcweb_admin_actions(){
    add_options_page("TVC Globals", "TVC Globals", 10 , __FILE__ , "tvc_global_admin");
    }
  function tvc_global_admin(){
    register_setting("tvc_globals", "tvc_global_main");
    $tvc_main = get_option("tvc_global_main");
    print "<div class=\"wrap\">
    <h2>TVCWeb Global Settings</h2>
    <form method=\"post\" action=\"options.php\">". settings_fields("tvc_globals") ."
      <div class=\"form-table\">
        <p>site root<br />
          <input name=\"tvc_global_main\" type=\"text\" value=\"$tvc_main\" />
          </p>
      </div>
      <p class=\"submit\"><input type=\"submit\" class=\"button-primary\" value=\"".__("Save Changes")."\" /></p>
    </form>
    </div>";
    }