Cant get right resolution on tv?

I have a 42 inch Philips plasma screen and have tried to connect my sony vaio vgn-nw26m to it via VGA (COM) to DVI (tv). I am getting a duplicate screen ok but it is way too small on the tv and have tried changing resolutions on the laptop. I am running windows 7 home premium. the highest resolution the laptop gives is 1366x768. I do not know where i am going wrong here and have searched forums and site for help...what do i do? pleeease help.
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More about cant resolution
  1. you set your TV to 720p?
  2. there is no setting on my tv to change to 720p...i found this really strange as it's a philips ambilight hd ready...?
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