I use Microsoft Essentials for my Anti Virus and it is free. Before you download it be sure to delete all other Anti Virus programs. I had Kapersky and got a virus which would not clean up. I called them and they wanted $300. to take care of my problem. Had to take my computer to someone to get rid of the virus. NO more Kaperskey for me and it was expensive. I am very happy with Microsoft Essentials as are other people I know.