yepp that is a fake alert. was it one time or do you see this constant?

try clear the crap with this >> https://www.malwarebytes.com/adwcleaner/

If still a problem, follow instructions here >> https://forum.avast.com/index.php?topic=194892.0

attach requested logs

  • Malwarebytes scan log
  • Farbar Recovery Scan Tool diagnostic logs