Cannot download videos from YouTube

For better than two weeks NOW, my problem has been I get the message, "This video is unavailable".  What I have done, 1. Emailed VDownloader support about two weeks ago...NO RESPONSE.  2. Googled my problem,  NO HELP.  3. Removed the program though my control panel and reinstalled from my VDownloader + CD, I could not load my Key to upgrade to the + version, this was still NO HELP.  4. Removed program AGAIN through my control pane and reinstalled from YOUR website...STILL not working and STILL get the same message, "This video is unavailable".

Thanks...Joe !