hm... Bad Length. Sounds like your file is either corrupt or incomplete. You said you tried re-downloading already right? Have you ever experienced anything like this before?

How did you get your file? Did you get it from the Torrent Network? Where was the invalid chunk information located? Was it under the file length, video information, audio information or rendering information section of the program?

If it was under length, and you got it via the torrent network. Then that part of your HD may be corrupt and can't be fixed. I'm not saying it is, but it may, and i don't have any other possible solutions or explanations on my part... sorry =/

If it's under audio, or video. One of your codecs may be corrupt, in which case you should re-install some. You should only need to re-install 3 basic codecs tho to play the file: xvid, divx, and wmp9 codecs.

If it's under rendering, then i have no solution for you i'm afraid. If G-Spot dosn't suggest or state that it's a codec problem, i really don't know.

I just hope you got this file via a different source other than through the torrent network..