hey guys, I've got a slight problem here....

I've got a 1080p video and its about 10.3 gigs in size

Now, when I play the film, the video is laggy...the framerate isn't matching the audio..im assuming because of its massive file size or resolution.

Anyways, if you guys could help me please do

I've tried watching it in divx which makes it even worse, on windows media player the audio is fine but the video lags...