Problems with PC to TV using HDMI/DVI converter

I'm currently running a pretty mid-range system with a 9600 GT with DVI/VGA output and have it set up to a Samsung 32inch HDTV using a DVI/HDMI converter. It's great for watching things like BBC Iplayer and 4od, however whenever I try to run a game, the colours are extremely poor and everything flickers whenever I move the camera.

Anyone else had this problem? Is there something I need to alter to ensure this doesn't happen? I know you can run games smoothly using this method as I've seen it on the net.

Cheers.
 
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