Instructions
As soon as you realize you have accidentally erased a picture off the camera's memory disc, stop using the camera and turn it off. While you can no longer view the picture, the file is still on the disc and will remain there until the physical space it occupies is used to save a new photo.
Connect your camera to a computer using a USB cable or similar cable that came with your camera. Turn on your computer on, connect to the Internet and download one of the three programs listed in the Introduction.
On your computer, open the program you just downloaded. Click "File" and select "Scan/Start" from the new drop down menu. Click the icon that represents the camera you have connected to the computer, and click "OK."
Review the images that the program recovers from the disc in the new window that opens up once the scan has been completed.
Right click the icon that represents the digital picture that was deleted and save the erased picture your computer's hard drive. Remember where you saved it so you can retrieve the photo later.