renewed anti virus on Mac but Norton demanding subscription key for NIS

I have renewed my Norton Anti-virus on my mac but keep getting asked for a subscription key for Norton Internet Security. I only ever renewed the anti-virus. Message pops up every time i start mac. Plus, because I haven't got the NIS i can't renew and the subscription panel is a nightmare dumping me into spaces where the only way out is to start again. Any idea how to stop the NIS popup?