Hello Accurateboy, and welcome to Seven Forums.
You might try different screen resolution settings in the game to see if you can find one that looks ok.
If not, then you can go into the NVIDIA Control Panel
(right click on Desktop), and select the Adjust desktop size and position
option. From here, you would select your monitor if you have more than one, then click on the green arrow boxes to adjust your screen horizontal and vertical display position to how you like it on the screen.
Hope this helps,