1.Install and Run "URL Helper"

2.Select the adapter which you connect to Internet

3.Clicked "Sniffer Network" in the toolbar

4.Open http://video.google.com , then select the video which you want to view.

5.You will find the URL, see the below pic.

6.Click mouse right-button on the URL, then select "Download immediately". see the below pic.

7.URL Helper start to download the video in download area, see the below pic

8.If you want to open the the downloaded file's folder, you can click mouse right-button on the downloaded file. see the below pic.