I just installed the latest version of the 64-bit Adobe Flash Player 11 plug-in manually, because Firefox had been open and prevented automatic installation -- or rather, as so often happens, Windows may have buried a dialog box which demands a response under other open windows. Adobe also installed McAfee Security Scan Plus without my giving permission. What does this app do? Does it only affect Flash or would it steal resources when I already have another antivirus program (Microsoft Security Essentials)? Well, I uninstalled MSSP from the Control Panel Programs and Features list. It was only 8.3 MB -- maybe a teaser? Does installation leave my computer vulnerable?