Why is there no sound when I import youtube videos on windows movie maker?

I downloaded a couple of videos from youtube using youtube downloader and then converted them to wmv files. BUT when i imported the youtube vid on windows movie maker there is NO sound, I checked the volumes...EVERYTHING, but still no sound, please hotdamn HELP MEEEE
You can try this YouTube tools, it can automatically download and convert youtube video to other video and audio formats for mobile phone, iPod, iPhone, Pocket PC, PSP, or Zune ect.

Free download here:
http://www.youtubetoipod.org/
Here is a step by step guide about how to download YouTube videos and convert YouTube videos to other video and audio formats for iPod Video, iPod Touch, iPod Nano, iPhone, Zune, PSP, etc
http://www.youtubetoipod.org/download-yo...
Also, you can find some other software:
http://www.ask.com
Download YouTube videos
Save YouTube videos
Convert YouTube video
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Convert YouTube video to iPod
Convert YouTube to Ipod
Convert YouTube to Zune