If you are looking for a free anti-virus software you can try ClamWin. I don't know how good it is because I don't have it.I use Norton, but I'm really disappointed. We had to format our PC multiple times because of random viruses. T_T Plus, the "renew your subscription" thing totally sucks because Norton is a totally disappointing program. If I could, I would switch to anything else (as long as it is legal and free).