If you have upgraded your Norton security product to the latest version – perhaps after upgrading your computer to Windows 10 and you see your desktop or laptop screen blinking, this message may help.
Computer screen flashing after Norton upgrade
Norton has detected this problem and fixed it. The product you have installed may be Norton 360, Norton Internet Security, Norton AntiVirus or any other Norton security product.
After downloading the tool to your desktop, you must start your Windows computer in safe mode with Networking. To do this, run msconfig (16) > Boat tab. Select Secure Start and Network, click Apply and restart your computer.