Maximum execution time of 30 seconds exceeded

I got this message when I visit my watchlog, and I found I cannot access any admin pages.
But when I remove the update_status directory, everything is ok. Is it due to update_status try to connect to drupal and get any problem?

Fatal error: Maximum execution time of 300 seconds exceeded in \www\includes\common.inc on line 479

Fatal error: Maximum execution time of 300 seconds exceeded in \www\includes\session.inc on line 56

Fatal error: Maximum execution time of 300 seconds exceeded in \www\includes\session.inc on line 14