Click on "Start"

Type "Advanced System Settings" into the search bar

Under the "Performance" section choose "Settings"

Scroll down and uncheck "Use visual styles on windows and buttons"

Click "apply"

Wait a bit while Windows grinds away and does its thing



Note that this will change the look and feel of your desktop, too. It's easy enough to put back if you don't like it, however. But then you'll be stuck with the boxes....

Hope this helps,
Dan