How do I get my computer's blu ray player to play on my HDTV with a FULL screen?

I have a computer with a built in blu ray player. It connects to my computer with a DVI to HDMI cable. When I play movies on my 50 inch Sony HDTV, it does not quite come in as a full screen, more like 90-95% (with black bars on all sides). How do I get the screen to fill up completely?

I have a Quad core 9600 microprecessor with an ATI Radeon 2400XT graphics driver.

Thanks!!!
PS: I can't clone b/c the blu ray disc won't play
 
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