Eddy
16
You may want/need to run AswClear before trying to install Avast again.
When it comes to security, I would say run Avast as real time defence.
Run a scan e.g. once a week with MalwareBytes
When it comes to a firewall you have two options.
- A hardware firewall (very much recommended)
- A software firewall.
You may already have the first one without noticing it. Nowadays they are often build into the router/modem that people are using.
To find out, check the specifications/manual of your modem/router.