I just downloaded Bitdefender and am trying to install it on my Windows PC. It asked me to uninstall Malwarebytes, Norton and System Shield. System Shield is part of Norton and as such unistalls as part of Norton and is not shown in Revo Uninstaller or my Windows 'Uninstall Programs' List. However, the Bitdefender installation still thinks it is installed as a separaate item and won't complete installation until I uninstall it which is impossible as it isn't there 😐️