I've been using Norton Antivirus for 10 years with no problems. Now, all of a sudden, every time I click the norton icon in my system tray, I get "NMain has caused an error in NMain.exe. NMain will now close" Then, when I click "OK", I get another little pop-up that's entitled Norton Integrator, and it says "An unhandled exception has occured. The error was: Unknown (OxC0000005)." Then when I click out of it, my norton screen is in jibberish. I have no clue what is going on or how to correct it. Anybody ever encounter this before?

Sounds like you might have got a virus. Check this thread and see if you can identify some of the symptoms I have described. http://www.computing.net/security/wwwboard/forum/11129.html

You've used Norton for 10 years now, are you still paying for up-dates? If you're not, your Norton is only doing basic scans and letting viruses in. I uninstalled my Norton after I used it for 3 years, then installed Avast! free home edition and it found 16 viruses that Norton didn't stop. If you like, give it a shot and you'll be amazed...Avast! has TOTALLY automatic and free up-dates while you surf....you never have to do a check yourself.