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Thanks. After removing the culprits from the virus chest, I can now go back to trying to figure out what is interfering with all the security cameras. After an expert failed to get them to work after 8 hours of trying and stating simply to replace the hardware (that all was functional independently), I am back to basically where I started before the hardware replacement. Something is still interfering with all the cameras. (Back to the expert?) I still do not know how Avast flagged an old file as positive, after ignoring it for nearly a year. In any case I never used it and have no need for a replacement. Thanks for all the help.(Maybe some of your knowledge will rub off on us ignorant with time.)