Border Padding

Windows 7

Right-click anywhere on desktop> Click on ‘Personalise’>Then on ‘Windows Colour’>Select ’Advanced Appearance Setting’>In the dropdown select ‘Border Padding’>Put the ‘Size’ to 0> Apply/Save Changes

Windows 8

Does not allow the same type of personalisation as Windows 7 therefore you will have to research options online: 

http://www.askvg.com/registry-tweak-to-decrease-window-border-size-and-padding-in-windows-8/

Windows 10

Does not allow the same type of personalisation as Windows 7 therefore you will have to research options online: 

http://www.tenforums.com/tutorials/5990-dpi-scaling-level-displays-change-windows-10-a.html