Unwanted download of Norton Security Scan when downloading ADE 4.5.4

I recently downloaded ADE version 4.5.4. Before the installation completed, a pop-up window to install Norton Security Scan popped up. I don't need it as I have  antivirus software. However, there was no way to shut it down, so I allowed it to download in the hope I could uninstall it subsequently. I then found I could not uninstall it. Please advise how I could uninstall Norton Security scan. And please would Adobe take action to stop such pop-ups which cannot be removed.