Plasma Screen TV & Flat Screen TV connected to Nvidia 7600..

Hello,
I am currently working on installing a plasma screen TV and flat screen
TV connected to a PC via DVI. The plasma screen TV is a Phillips 42"
and the flat screen TV is a Phillips 23". The computer has a Nvidia
Geforce 7600 GT (dual DVI). According to Philips documentation, both
TVs are capable of supporting a resolution of 800x600 at 60 hertz. I
currently have the Nvidia 7600 GT setup in a clone setting for both TVs
set to a resolution of 800x600 at 60 hertz. The 42" plasma screen TV
has a wonderful picture. However, the 23" flat screen TV does not look
right. The image is stretched off the screen. I have checked all the
settings on the TV, but have not found anything to fix it. Neither
have I found a setting in the Nvidia control panel which will solve the
problem.

Any advice???

Thanks.