Having error message pop-up again on startup this morning. There is a message of system at risk and the program shows it's in the sonar section. Thought it was good after using removal tool and clicking on the other downloaded program ( NAV-ESD-18--5-0-125-EN.exe) on 3/20/11. To get the risk off I had to disable Sonar. Is this a Norton problem or is it something coming in on my DSL line? We always shut down the computer at the end of the day and when we do leave it up during the day we close IE and Foxfire as soon as we finish with the programs.