How to download youtube from Keepvid.com

first you install java here 

• java full version.exe
  http://www.filefactory.com/file/c0359eb/n/java_full_version_exe

1. then install in your computer.
2. search videos on youtube.

3. copy url of youtube video

4. paste in keepvid download section & then click download

5. many formats of downloading shows here. click on the format as you want to download.
6. enjoy MP3, MP4, FLV, 3GP & WEBM format