1
Are the objects on the screen too small, or is there now a black border around the screen and the image does not fill up the full screen, please provide a screenshot of the problem you are seeing.
2
Right click the Desktop and select 'Display Settings'.
Please provide a screenshot of the resulting Settings window.
3
Right click your Start Button and open Device Manager.
Expand the Display Adapters section, please provide a screenshot of that full Device Manager window.