renewal of Norton Subscription

I bought my notebook two months back which included one month Norton subscription.

My Norton Subscription expired one month back.

Now I want to renew my subscription. But I dont know whether it is NAV or NIS.

Help me how to renew my Norton subscription.

Also plz. advise whether I should renew it or buy a new subscription. Since my existing free subscription expired one month back.

Plz. Help