How to reverse scrolling with the mouse

My 2007 iMac crashed a couple of days ago and I lost all my settings including mail etc. I can't the mouse to scroll the way I want. I want to scroll from top to bottom but it is reversed. In system preferences under point and click I have all 3 boxes checked:

Scroll direction: natural
Secondary click
Smart Zoom
They are all checked. I could swear that the first option scroll direction natural should be the one to do what I want, but it doesn't happen. I tried it with magic mouse and a wired logitech mouse but no joy. What am I doing wrong if anything. Thanks for a reply 

Disregard my post. I figured it out that the option scroll direction box should be left unchecked.