Webroot icon stuck in the finder window

I am using OS 10.13.1. When I shortcut between applications (Command + tab), the webroot icon is always one of the apps that appears as an option, along with, let's say Word, Firefox, whatever else I happen to be using. I never go to Webroot, so this is a distraction. How can I prevent it from appearing? (Just to be clear, I am not talking about the menu bar or the dock. I'm talking about a temporary window that appears when I'm using this very common shortcut.)
Tx.