firewall message

hi new to the forum so please redirect me if this is in the wrong place
ive got Avast premier but keep getting a attention notice that says firewall is off when i click turn on i get a small box come up avast information unable to start firewall
any help for this old techno failure would be great
many thanks

Repair Avast:

  1. Control Panel → Add/Remove programs → Avast
  2. Click on ‘Repair’.
  3. Follow instructions.
  4. Reboot.