Instructions
Open the Adobe CS3 software. When the program launches, click "File" and select "Open" to open the picture you want to correct.
Click "Filter" in the navigation bar and select "Distort" from the drop-down menu. This will generate another menu. Select "Lens correction." This opens a new window that contain the image you are working with a grid square laid on top of it.
Click and hold the "Remove distortion" slider located on the top right side of the new window. As you adjust this slider, the image in the window will also adjust, allowing you to see the effect you are having on the picture.
Click "OK" when you reach the amount of adjustment you want to apply to the picture. Adobe CS3 will now apply this adjustment to your picture.
Click "File" and select "Save as" from the drop-down menu. Name your new image and save it to your computer's hard drive.