Avi Codecs?

I tried to open an AVI file that I am sure tI viewed before but now I get an Unknown Error from media Player 9.

Do I kneed a new Codec?
What could the issue Be?
Do I need a different viewer?

Run the file through freeware ‘Gspot’ and see what it says.

Ok did that.
Says the file header is corrupt.
I am sure I viewed this before though.

Any way to repair it?

Open with VirtualDub and try to repair the file.

I did that & it returns te error : the AVI file does not have a movie block