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Question: Running laptop through yamaha RX-V863 to TV via HDMI

What I have to do to play a Blu-Ray disc on my laptop Acer 8920G via HDMI through my yamaha RX-V863 to TV via HDMI?
I can transmit the desktop, but it appears "too big" on the TV and when a Blu Ray movie begins, TV screen goes black and there is no sound. At the same time on my laptop everything is OK - very good picture and sound.OS is Vista Ultimate, Nvida GeForce 9600 driver updated. Any idea which setting I should change?