I have been using MacBook Air with Lion. To match with the touch pad behavior, Apple decided to reverse the direction of mouse wheel. Now that I get used to wheel up to make the content to scroll up.

I wanted the same behavior on Windows 7. Here's how to do it.

- First, find out VID for your mouse. From Control Panel, click Mouse. On Hardware tab, double-click the HID-compliant mouse. When in the details tab and select the Hardware IDs property. The value for the VID_XYZ number is in there.

- On RegEdit, go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\HID\VID_{XYZ}\{some numbers}\Device Parameters, where VID_{XYZ} is from the first step.

- Change the FlipFlopWheel value from 0 to 1.

- You may need to unplug and plug back the mouse (or reboot the PC).

Enjoy reverse mouse wheeling!