Too big delete button

In windows 7 when i select to see the labels in icons the delete button is too big

How can i have the icons of win xp?

That is a "three-button" with different actions (which each have their own icons and labels) for the left, middle and right mouse buttons.

The width of a three-button will be the width of the widest of those labels.

So enter Customize mode and click the button to display the three actions it contains and you'll see that one of those actions has a really wide label. Edit that to reduce the width.