|Deleted photos whose space is now occuped by new pictures won't be recoverable. You should be able to recover those that haven't been overwritten. It's not too hard to find software to recover lost files. Here's something that worked well for one user:|
Try the free/demo version.
I assume the photos are on an SD card? You'll either need to remove the card and use a card reader on your computer that's compatible with the card or connect the camera directly to the computer's USB port in order to use the software.
If the photos are on the camera's internal memory I think you'd need to contact Nikon and see if recovery is possible.
Others may post in with different recovery suggestions.
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