I just had to post here because I use COMODO Firewall alongside avast! (and well, other things). First of all, you can delete entries from the Trusted Vendors List, but there is no option to select all >:( . To bypass this so-called “Trusted Vendors” list, go to Defense+ settings in COMODO > Sandbox Settings > then uncheck “Automatically detect installers/updaters and run them outside sandbox” and also uncheck “Automatically trust files from trusted installers”. Also if you want, set you sandbox level to “Limited”. If you choose to delete from the trusted vendors list, give yourself 1-2 hour(s) and 5 cups of coffee. Just a bit of advice.