My name is Ru. I'm an Independent Advisor and I'll be glad to help you today.
You can do the same change Via Control Panel using the following guide.
Click Start then type Control Panel to access the control panel.
At the top right corner under View by: change that to Small icons.
Click on "Mouse" and a small dialog box will appear.
Under the "Wheel" tab > Vertical Scrolling > Set number of lines (3) from the "The following number of lines at a time" drop down.
Hope this helps