Download advanced system care and use their uninstall tool called "iobit uninstaller". It has a powerful scan (you must select this after the regular uninstall) that will search the registry and delete any remnants. It looks like you already tried to remove it though, in which case you may need to approach this differently. Why are you trying to delete outlook to start a new account. You can delete your old account from the file>info>account settings menu. If you are deleting an older version of office and upgrading to 2010 then that is another issue altogether.