Videos out of sync

I've been catching up on some naruto shippuden recently. All the files I have are in .MKV format, and since WMP doesn't recognise the subs on the video, I'm using the Classic Player. Problem is, I open up the video, it plays fine for about 3 or 4 minutes, then the audio keeps playing and the video starts to get out of sync, like it's lagging. It gets so bad I can't even watch it. I was thinking about downloading VLC, but my internet is down at home right now. Any suggestions, maby there are settings i can change to help?

Also, I do have a virus scan running, but that shouldn't make it lag out like this, since i tried opening it up in WMP and it plays fine, just without subs.

EDIT: Took a look at some of the video information, and it's not great at all.
Framerate: 18-21
Sync offset: avg: ~170ms dev: ~365ms
Frames ( after approx 10 mins): drawn: 6000 Dropped: 1875
Jitter: 95ms
Bitrate avg: 23Kb/s
I also noticed that there are 3 buffers, and the 3rd isn't doing anything at all, not sure if it is or not

so basically what I'm seeing is that it's dropping approximatly 1/4 of the frames, for what reason I have no clue.

Wiki references "Multiple Kill Vehicle"

Open source MKV files
http://matroska.org/downloads/windows.html
with codec pack(s) to go
http://www.cccp-project.net/ :haha:

I've been catching up on some naruto shippuden recently.

Click to expand...

Please explain?

naruto shippuden is an anime series, made in japan, so it has subtitles for all us english speaking folk.