I have a huge problem. My computer was returned to me yesterday (I have Vista) and my Internet Explorer security has gone totally neurotic. It blocks things that it never used to. It keeps saying, "To help protect your security, IE has blocked this website from displaying content with security certificate errors. Click here for options..." but this never happened before. And trying to allow the blocked content doesn't appear to make a difference. Also, whenever I go on certain pages, the links have all been replaced by a white box with a red cross in it. For example, when I go to iTunes, there is a red cross in a white box where the "DOWNLOAD" button used to be. Help me. What do I do?