How To Put Two Computers On One Account?

I have two notebooks, both bought at different times in 2008, and each has Norton - one has Norton AntiVirus, and the other has Norton Internet Security. Both have been updated/renewed each year, and both will auto-renew on January 8th - the Internet Security for $69.99, and the AntiVirus for $44.99. I wasn't aware when I bought Norton for each one that I could cover two computers with one product.

 

How can I cancel the AntiVirus auto-renewal and cover both computers under the Internet Security product? Both computers are in one household - one is my primary computer, and the other one is used when I travel.

 

Thanks!  :smileyhappy: