One of my old PC's died, which had one of the 3 allowed installations of NIS 2011 on it. I bought a new HP PC to replace it, which came with NIS 2011 with a 60 day trial period, with about 25 days left. My purchased NIS 2011 has 84 days left on it. How do I get the purchased key entered into my new PC, so the expiration date will be the same for all 3 of my PC's?