I really am pretty stupid when it comes to antivirus software. I recently purchased the full paid version of malwarebytes. I would like to scrap McAfee and try the windows security essentials in its place but am not sure if it replaces the malwarebytes or if the two can run at the same time. Also do i still need a firewall program and which would be compatable with malwarebytes and windows security essentials. These are probably really dumb questions but I am old and truly computer stupid. Any advice?