I finally decided to upgrade my Norton's program, from NIS to Norton Security Deluxe. Since I am upgrading the program, would it be best to use the NRT, to remove the old NIS program and then install the new Security Deluxe, or just let the Deluxe program install itself? All I have is the download card and it suggest just entering the product key and follow the prompts. Will that remove the old NIS program?