The files are probably either fake or corrupt or they might not be available at that time. Try using
Bitzi Web Lookup to see if anyone has rated the file before you try to d/l it.
Try d/ling a video from here
http://www.magnetmix.com/video.shtml. They're legal to d/l. Just click on a link and it will d/l in LW. If you can d/l audio files you should be able to d/l video.
There are a lot of fake/corrupt files being shared on the network. You can find info in this sticky:
Major Topics for Upload/Download Help. What type of files are you trying to d/l? For video I stick to mpg/mpeg and avi. They seem to be the best quality and more reliable. Hope this helps
.