Panasonic VIERA S1 Series TC-L37S1

If the Viera is 1080 capable, nothing special should be needed. If Viera is only 720, then you may have to reduce your PC out to 720 before making connection to Viera.
 
Is your PC outputting 1920 x 1080? Try that or 1280 x 720 see what happens.

If that doesn't work, maybe Panasonic.com has a set of video drivers you can download?
 

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