I have a virus that posts its site on my landing page / home page. It cannot be dismissed. I cannot find any part of its URL in Finder. Norton Antivirus doesn't detect it. It cannot be overwritten. It cannot be edited away. It CAN be moved to the fourth line of home page icons and only three lines shown, which puts it out of sight. Rebooting the machine doesn't cure it. Can I find the listing of sites on my home page and remove it from the list? Any help would be appreciated. I'm not good with computers so help has to be put in simple terms.