Every day, sometimes twice or three times a day, Norton 360 tries to install itself, and complains I must delete Microsoft Security Essentials first. I am of course very suspicious of anything that says I have to delete some security, and anyway I already have Norton 360 installed and running. What is going on? If it really is Norton why does it (a) have to be installed again and (b) why is there no explication? But then again it could be a virus cleverly emulating Norton. I need to be told!!!!