Reply To: Avira Antivirus Unknown Error 857735165 Luke File Walker Posted on by Webmaster 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 8:08 am #1409 WebmasterKeymaster Hi and welcome to the forum. In your case, Unknown error 857735165 might mean that the antivirus signature update process is corrupt. I’d reinstall Avira, if I were you and see if that fixes it.
