I've used Norton Ghost for many years and in the process of changing out some hard drives, I deleted several backup files with Windows Explorer. Now I realize that I should have done it through Ghost. As a result, my backup history shows lots of backups that don't exist. This includes both drive and file backups. How can I clear out the backup history of everything except for the backups that really do exist? Do I need to uninstall Ghost and reinstall it?