A new version released today 9.0.2018.
It would have been better if you stayed on the same topic but since you already did one and it hasn't removed the 3 entries, you may have to do it manually.
You need to do a clean install because since v9, the firewall doesn't list any miniport drivers in device manager anymore.
You need to remove them 3 manually before installing avast by right click > uninstall through device manager if they are not removed after running both uninstallers.
On another note, are you sure your PC isn't infected? (that can cause problems with avast installing/not functioning)
1. Download Avastclear, Rejzors uninstall tool and the appropriate Avast program edition
Note: It's important you used the stub online installer from the one I linked.. NOT the offline one.
Note: You need to be ONLINE during this install (online installer works in all cases whereas offline sometimes doesn't)
http://files.avast.com/iavs9x/avast_free_antivirus_setup_online.exehttp://files.avast.com/iavs9x/avast_pro_antivirus_setup_online.exehttp://files.avast.com/iavs9x/avast_internet_security_setup_online.exehttp://files.avast.com/iavs9x/avast_premier_antivirus_setup_online.exeAvastclear :
http://files.avast.com/iavs9x/avastclear.exeRejzors Uninstall tool:
http://rejzor.wordpress.com/avast-cleanup-tool/2. Uninstall Avast by control panel [If you don't have Avast in control Panel go to #4]
3. Uninstall in safe mode using Avastclear.
4. Run Rejzors Uninstall Utility in Normal Mode (removes traces avastclear doesn't) - reboot.
Check : Once uninstalled check in device manager>view>show hidden devices if there is anything related to avast with a yellow triangle.. if so, uninstall it and reboot.
5. Install the version you downloaded.
6. Reboot.
Note : If you have a paid license, install it after the reboot at stage 6.