Help with NIS 2009 for 3 PCs

Hello,

 

I purchased NIS 2009 for 3PCs at the store and was hoping to share it with my mother's computer at her place. No Norton product is installed on her computer. Now I just noticed on the NIS box it says per household. So I would just like a confirmation on whether or not I can install it on her PC.

 

As for me I have 6 days left on my current subscription which seems to also be a 3 PC (says so in my Norton Account). Do I just need to enter the new key to start my new year?

 

Thanks for your help.