Download Ant Toolbar at http://www.ant.com/toolbar and install.

    *  Easily download videos from a variety of streaming sites such as YouTube, Google video and save them to your hard drive.
    *  Integrated Flash video player with your browser so that you can instantly play the videos you have downloaded even when you’re not connected to internet.
    *  Is totally free and contains no adware or spyware at all.

Go to the page where the video is playing. Click the Download Button when video is buffering.
When the download completes click the Player Button to play the video.
You will need a converter for you to play it other players.