First of all, Leo says using a six year old browser is probably causing a lot of those problems. She should update it to IE 8, or use a different browser like Chrome or Firefox. Leo thinks that most people should switch to Google Chrome as their browser, though.
She should also uninstall that Norton toolbar. If she still wants something to check to see if a website is dangerous, Chrome will do that automatically. But It's far more important to run Windows Update and use the most up-to-date browser than have the Norton security toolbar she's been using.