Vista - Monitor + HDTV WMP 11 & VLC problems

Hi,

Apologies if I have repeated a previous question, I searched but found nothing specific to my problem!

I am trying to use my PC as a media centre to be able to play video content on my HDTV in another room. My PC has a dual-head graphics card (an nVidia GeForce 9800 GT) with 2 DVI ouputs. My primary display is connected here, as is DVI+Audio>HDMI box, which sends the signal to my HDTV. I have managed to get a picture on the TV which was fairly straightforward. The displays are set up to work independently as clone won't work - my monitor won't go above 1680x1050 and my TV won't go below 1920x1080. My problems are as follows:

1. Windows Media Player 11 won't display anything on the TV - The main window displayed on my monitor shows that it is being sent to the secondary display (the TV) but nothing is coming up, all I can see is the desktop wallpaper.
2. VLC - Similar problems, have tried to configure VLC to use DirectX and the correct display but nothing comes up or just displays on my monitor

Any help would be appreciated, sorry my first post on this forum was so long! Johnny-come-lately's ruin it for everyone, eh?!