Installed Norton then set computer back to factory same day

My Norton was expired for a bit and I put off paying for it. Anyway, my computer began saying "high cpu usage" and "com suggogate" After I paid for my Norton and ran my scans. I deleted about everything on my computer and backed up all my family photos. Didn't help so I set it back to factory settings. That fixed the problem! Computer is like new. But here's the new problem. I paid for a year subscription of Norton and now its saying I have a free two month subscription. what gives? will I still have Norton til next year?