I have the same problem. You can't get the native resolution with a VGA cable - maybe others like HDMI, I'm not entirely sure. Try [url=http://www.avforums.com/forums/lcd-televisions/333378-toshiba-32wlt66-no-go-pc.html][/url] for more information
In the meantime, I just pressed the button on remote that changes screen size and using the "wide" setting it stretches-to-fit, but obviously isn't native resolution or 1:1 pixel ratio