Although cailyn has Windows 8, this has nothing to do with Windows 8, but rather with Webroot requiring a special uninstaller. I found a lot of hits on the internet about people being unable to uninstall it from Control Panel. A lot of anti-virus programs seem to have this "feature" to keep malware from uninstalling it. I think it's a pain to force you to use special uninstallers.
In my PC corner for the winter, gaming, knitting and reading.