Yes, I can help you with that! In Excel 2007, you can change the number of rows that are scrolled with the mouse wheel by adjusting the Windows settings for your mouse. Here's how:

1. Click on the Start button in the bottom left corner of your screen and select Control Panel.
2. In the Control Panel, click on Hardware and Sound.
3. Under Devices and Printers, click on Mouse.
4. In the Mouse Properties window, click on the Wheel tab.
5. Under Vertical Scrolling, you should see an option for "The following number of lines at a time". Change this number to 1.
6. Click Apply and then OK to save your changes.

That's it! Now when you use your mouse wheel in Excel, it will scroll one row at a time instead of three. If you have any other questions, feel free to ask!