Norton is the cause of a lot of computer problems. Computer repairmen love Norton. Easy to fix and cha ching! If you have two anti virus programs installed you will certainly have problems. The anti virus programs fight each other. I have used AVG anti virus for many years and I have never had a computer virus on any home computer I have had. The free email programs like Gmail, won't let a virus through. Most internet providers email allow junk mail and virus emails download to your inbox. It's up to you to not open them. I haven't had spam since I stopped using internet and Windows email.