Windows 7: Problem playing HD TV in WMC

Hi,

I bought a Tiny Twin USB TV tuner today.

I'm running Windows 7 64 on an Atom PC with nVidia ION GPU. I'm using Windows 7 Media Centre.

I can get all of the channel to scan fine, however none of the HD channels will play? Is this a known issue and do you know if it's to do with the audio? When I go to one of these HD channels, I see a few frames of vision with no audio. Then Media Centre says "Files needed to display video are not installed or are not working correctly. Restart Windows Media Center or restart computer." Right before it does this I see the little Dolby audio icon show up.

Very odd that I can play all channels fine but not the HD ones? The PC is capable of playing Blu-Rays at 1080p so I wouldn't think horsepower is the issue...

Any ideas? I've updated all of the video/audio/chipset drivers to no avail. Have been googling a solution all day.

Thanks