You will get a better picture quality via a HDMI cable.
With the TV and Laptop switched off connect the HDMI cable. Turn the TV and laptop on and switch the TV to the correct HDMI channel. You may have to go to Start/all programs/accessories/connect to a projector or press one of your F keys to select the TV.
If you want sound through your TV you may have to right click on the speaker icon on your taskbar and select playback devices, from here change the default output to HDMI.