Imcomplete Product Key for NIS 2012

Hello,

I just purchased the NIS 2012  online and I realized that no matter how many times I opened it and closed it out, the subscription status still showed 1 day remaining. After a little research, I finally figured out how to download it properly and enter the product key. However, I read that the product key is suppose to consist of 5 sets of letters and numbers but the one that I received on my reciept of purchase was only 4 sets of numbers and letters. I've tried putting these numbers in anyway but the button that says "next" after entering remains grey. It is not allowing me to move on to activate the product I'm assuming, because the product key is invalid. How can this get corrected because I've paid for the product already and would like to use it. Thanks for your help in advance.