.mkv Audio Problem

Hello, recently I have downloaded a film in .mkv format. After searching around i downloaded the mastroskasplitter to play it on my DivX Player. However i was having trouble with audio and so downloaded ffdshow and finally got sound. However! it is playing both english and japaneese sound tracks at the same time. How do i stop the Japaneese sound track from playing and keep the English one going?
Thank you for any help.

use pure codec player.
that included everything in it.

use pure codec player.
that included everything in it.