Firstly, connect this camera to a computer or laptop before you take any new photo or video by using this camera. (Of course, you also could use pick out the camera memory card and connect it to your computer via a card Reader.)
Secondly, opt for an efficient camera data recovery tool to copy off your deleted pictures. After searching over the internet, you could easily get numerous camera data recovery tools. Put much more importance to select a right one.
Thirdly, follow the guidance carefully to restore your deleted pictures after downloading the camera data recovery tool.
Fourthly, store your restored pictures on separate drive or card for backing up.
If you want to know further detailed information, you could visit:
http/www.squidoo.com/recovery-photo