I would like some more info. What mode are you in? If you right click on your desktop and hit "Screen Resolution" whiel connected to the TV and tell me if you are on Duplicate Display, Extend Display or Second Display only. What cord type are you using? VGA, HDMI, DVI? A model number would be nice for both the computer and the TV as well. Can't do much without more detailed info.
Generally it is best to avoid using third party ways to connect and manage displays (Vaio Center) and just straight us the OS.
Did you figure it out? I was about to say you are in Duplicate display if it says 1/2 Multiple Monitors (my fault for using display mode as the term) and to try extending the display instead and see if you can't change the resolution on the TV from there.