Norton Internet Security 2009 Re-install

Hi… I have a two year license good for 3 PC’s until January 2011. I had to uninstall on my XP and now I wish to reinstall. I only installed it on 2 computers originally. When I check my account I see no way to download the product. I only installed on 2 PC’s originally plus I paid 10.99 for am extended download. How do I download and install back on my XP computer? VERY frustrating. My subscription is still valid for another year and a half. Thanks