I've had to remove and reinstall Norton several times now for the past month. When I notice the system icon disappears, I'll launch Norton and after 5 minutes or so it says that I have an error and will run the autofix. It'll say an update was successful and just have a close button and not startup. I will run it and again get an error. This time was 8504, 104.. not sure if the code has been the same in the past. But in each instance it asks me to use the complete removal tool and reinstall.
I am using Norton Security Suite via Comcast, after reinstalling it.. current version is 21.1.0.18. Windows 7 Professional Service Pack 1 32-Bit.