MP4 movie error: No audio and video tracks found.

I recently move all my movies to a better performance hard drive. I imported the movies or playlists to iTunes. All movies were playing flawlessly until one day I get the dialog "Can't access file" ... I tried several things I encounter on this communities but the files still not played.

I can see all the files with their size on the hard drive, but when I try to imported or drag to iTunes, they simply not appear or they don't import at all.
In one of my test I found a dialog appear indicating "Error opening file: No audio or video tracks found" ...

I need the way to fix this situation, since I have over 500 movies on that drive. Would somebody help me ???

My email is metalkid@gmail.com, just in case you want to help me directly.

I can even pay a nice reward to the person who help me fix this issue. Seriously.