Sound like you need to increase your screen resolution Peter.
Right-Click on your Desktop > select Properties > Click on the Settings Tab
You'll see a section titled "Screen Area", with a horizontal slider control, move it to the right 1 notch to increase your screen resolution, then click OK.
Your screen will change resolution and ask you if your happy with it and would like to keep the new resolution (you have 15 seconds to confirm this).
Bear in mind your screen will screw up if your graphics car does not support that resolution, if that happens just leave it for 15 seconds and it will revert back to your current screen resolution.