here is another challenge
After downloading and running the COMODO removal tool, restarted the pc and tried installing PC Tools firewall. Same notice appeared. But I decided to give it a try and installed it. After rebooting, low and behold my internet acted the way it was before - unable to surf. So applying what I've learnt the past couple of weeks was to uninstall the app. Internet is back as normal.
So now what should I do to rid my pc of traces of COMODO since if I don't do so, installing another firewall app will only stall every other app that requires internet connection.