Drops errors throug activating

Notice: register_sidebar_widget is deprecated since version 2.8! Use wp_register_sidebar_widget() instead. in D:\xampplite\htdocs\wp3\wp-includes\functions.php on line 3382

Notice: register_widget_control is deprecated since version 2.8! Use wp_register_widget_control() instead. in D:\xampplite\htdocs\wp3\wp-includes\functions.php on line 3382

Notice: has_cap was called with an argument that is deprecated since version 2.0! Usage of user levels by plugins and themes is deprecated. Use roles and capabilities instead. in D:\xampplite\htdocs\wp3\wp-includes\functions.php on line 3466