The issue has to be with the display settings. Leave the Nvidia setting to automatic as far as what to report to the display (overscan, underscan, automatic). You should have a setting for "1:1" or "dot by dot" on the display. Also, make sure you are using 16-235 (video broadcast standard) for video on your display. 0-255 is the normal setting for computers and this will washout the blacks on the display.
Check out what was suggested above, but also realize that WMC 7 overscans regardless of your settings if you selected flat panel as your display type in WMC 7 setup. You need to set the display type to television in WMC 7 to stop the overscan. If you setup the display properly you will see corners around the UI elements because they all moved closer together due to the elimination of the overscan. You can push the UI elements back out to the corners of the display with a very simple registry modification (this will also fix the blue boarder around TMT5 if it is integrated into WMC 7). See the link below for the explanation. Simple fact is that if you set the display type to flat panel in WMC 7 the image will overscan and you will not be seeing 1:1 pixel mapping.http://www.missingremote.com/guide/m...7-media-center
To push the UI elements back out to the corners after getting rid of overscan, you can modify the registry:
[HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVers ion\\Media Center\\Settings\\MCE.PerUserSettings]
All this does is move the UI elements back to the corners.