After installing GoogleVoiceAndVideoSetup.exe, Chrome still tells me to install the plugin when I visit a Google+ Hangout or try to use Gmail video chat.
I have even uninstalled the plugin from the Control Panel's Programs and Features, and then re-installed it again, and I've even tried restarting my system.
I am running Windows 7 64-bit Ultimate SP1 with a Microsoft HD LifeCam Webcam.