First you need to right-click on Desktop and open select Personalize.
Click on Windows Color & Appearance.
Here click on Open Classic Appearance Properties.
In the new dialog box select Advanced.
Again a new dialog box will open. Here from the “Item’ drop down menu, select Border Padding. Change the default value from 4 to say, 1 and click ok 2 times.
That’s it enjoy your new vista borders.