You cannot rote learn mathematics, the most you can do is outline concepts and steps but it would not be enough.
I found Norton products to be quite unreliable.
If viruses have become a significant problem, the first step is to go to:
http://housecall.trendmicro.com/au/ for a free online scan.
There are many free alternatives out there to retail products such as Norton and often more reliable free alternatives such as AVG or avast.