Reply To: Avira Antivirus Unknown Error 857735165 Luke File Walker Posted on by LisamJackson IT Support Forum › Forums › Antivirus › Avira › Antivirus Pro › Troubleshooting › Avira Antivirus Unknown Error 857735165 Luke File Walker › Reply To: Avira Antivirus Unknown Error 857735165 Luke File Walker October 11, 2015 at 7:51 am #1408 LisamJacksonParticipant I’ve tried that several times, hasn’t worked at all