Symantec's Norton 360 Security Suite is one of the best Computer Security for PC and Mac on the Market. It can be purchased from Symantec for $160. I obtained free from Comcast. Norton 360 is a perfect security net with no holes. Once it is installed on your computer, your machine is almost impenetrable. I have a copy installed on my developer machine and it has almost every security feature known to man. It screens every website you visit, scans every download for any malware, spyware and viruses. It does daily scans on your hard drives, however many there might be in your computer. And you can back-up all of your files to a Norton back-up cloud drive that you can access from anywhere, on any other computer you own running Norton. Norton 360 also has identity protection and pc tune-up. The layout and user interface of Norton 360 is very easy to use and simple. Before Norton i used to use McAfee and before that I used AVG Free Edition. Out of all the products Norton was definitely the best. My computer stays running fast because it has never been infected with a virus. If you are a Facebook user I highly recommend it because most people don't know that Facebook can infect your computer very easily. Norton can stop viruses from social networks so you have nothing to worry about.