video player

First make sure you uninstall all the codec packs that you have downloaded and try to download the latest codec packs from the net kcodec and try to reinstall again and that should fix the issue.. Basically if the right codec is not installed this causes lot of issues.. However .mkv files takes more processor than other movie files and .mkv known to be HDTV content and you need to have good processor and RAM to rum smoothly...

you can try downloading codecs pack and players from one of my favorite sites http://www.free-codecs.com

i recomand bsplayer and vlc players..

Kmplayer w k-lite is da best

I the nero I use his player(nero show time)

gooooooooood work