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Protect Hosts File

Assuming you have Avira Premium Security Suite, You can Lock Hosts File in your computer so malwares cannot Hijack it to redirect you to malware sites or prevent you access internet.
Before Lock your Hosts File it's recommended you immunize your computer by block malware domains using HostMan and then Lock your Hosts File, you can come back unlock your Hosts File to update your blocked domains in Hosts weekly or once a month.

To Lock Hosts File:
  1. Go to Avira and open configuration window
  2. Go to [+] Firewall > Settings > Click Lock now (See the image below) > Apply > Ok