What operating system are you using? Windows?
Is this a laptop with a wide screen, wider ratio than 4x3 (1024x768)?
I am just guessing, but I suggest that you try a different desktop resolution / screen resolution. In Windows, that was set in Control Panel -> Display the last time I messed with Windows. I'm going to guess that anything larger than 1024x768 should work. For a laptop or modern LCD display, something like 1366x768 · 1600x900 · 1920x1080 · 2560x1440 ...