All video downloads are same size (67.3KB)

[Cool-Head]

When I try to download videos, they are all 67.3 KB and do not open. When I try to launch a video I get an error message saying "Couldn't open the file <file name> because a software component needed by the movie could not be found."

I'm using Mac OS 10.2.2
Here's what I tried to do to solve the problem:
I downloaded DivX 5.0 decoder and applied it
I downloaded Mplayer
I downloaded Stimulus
I downloaded VideoLAN Client

But I don't think the problem is with the player. These 67.4 KB files have a mpg suffix on them. They are obviously too small to be a video and I suspect they should not be mpg files.

What can I do to correct this?