I work in the IT field and the first thing that I always do is uninstall Norton and/or McAfee when I get a new pc or laptop. You can download Microsoft Windows Essentials from their site and it free and works great at preventing any issues. Even though Norton was installed on my Win 8 laptop that I just got I also noticed that windows had also installed the Essentials so I just have to activate. I also have it set up to automatically check my pc on a weekly time frame. The problem we've noticed mainly with Norton and McAfee that unless you pay them to monitor your system, they make your system run slower and even during the free period you have when you first get it, they aren't that great. My work place has litterly thousands of pc's and you won't find these programs on any of them.