Hello everyone. Just joined today. My question is regarding norton 2010. I have it installed on my sony. It came installed when I purchased the laptop. I purchased the verison after my free trial subscription expired. I now have the paid product key. I am also no able to use it on 2 more pcs. I just purchase an HP desk top for my wife. She too has Norton 2010 installed on her computer. Do I have to do anything or just enter my product key to activate her Norton. We have no norton disks because both pcs came with norton preinstalled. Thank you for all your help. George