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First of all, WELCOME to the forums Mike !
Second thing… never, EVER, NEVER install two antiviruses in the same computer !!! NEVER !
Especially Norton. Get rid of that piece of junk, uninstall it properly (go to Symantec web site and search for uninstaller), if you are comfortable with editing registry, clean all registry keys regarding Norton Antivirus…
Restart your PC, and perform clean install of avast!
Everything will work without any problems…
Cheers !
Keep us updated…