Can't play HD Movie

I am unable to play satisfacorily the following movie. I have tried every set up. The best is Boxee but even then it is jerky and out of synch. What is wrong?
Tim

http://www.thebox.bz/details.php?id=99285

Collision
Friday 13 November
9:00pm - 10:00pm
ITV HD

5/5
Tolin and Ann try to uncover what Karen Donnelly was up to. They look into Sidney’s past, and unlock the secret of his computer. Richard and Jane prepare to run away together. Now that Jodie knows about Tolin and Ann, their relationship can come out into the open. And the truth about the collision is revealed.

— File Information —
File Name: collision.s01e05.720p.hdtv.x264-bia
Duration (mm:ss): 44:31
File Size (in bytes): 1,172,723,136

— Video Information —
Video Codec Name: x264
frame Width (pixels): 1280
frame Height (pixels): 720
frames Per Second: 25
Video Bitrate (kbps): 3186

— Audio Information —
Audio Codec: AC3
Audio Sample Rate: 48KHz
Audio Channels 2
Audio Bitrate(kbps): 256
Type Drama
Source HDTV
Codec x264
Last Update 2009-11-24 15:59:06 (1:31 ago)
Size 1.09 GB (1,172,731,154 bytes)

Movie plays fine on my computer and through Itunes