For some reason I get consistent messages telling me that I cannot run Norton Internet Security. Files to access it have 'gone missing'. NSMain.exe is one, another is SmnLnch.exe, and another one that comes up is that 'NAVAPW32.exe is not valid in 32'. Does anyone have any ideas, as the stuff from Norton website has proved a fruitless waste of time - I don't know how to find the right thing if it is there at all, or why these bits may have suddenly vanished for no reason. I don't even know whether Norton is running or not because I cannot open it.