Ok! The dread “not formatted error” message generally indicates hard drive problems. This can occur for many different reasons including a computer virus, hard drive problem, power surge, or problems with the operating system. If you receive this type of error message, it is important that you act carefully to keep your important data safe.
1. Do NOT say "yes" to format the drive in case it could make things much more complicated.
2. Do NOT attempt to write anything new on this hard drive in case that new data would overwrite your drive data and make it gone forever.
3. Download data recovery freeware to help you. There are many data recovery tools out there. But, no all of them could be efficient and useful enough. You should pay much attention to opt for a proper one.
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4. Run the selected hard drive recovery tool to retrieve your inner files and pictures.
5. Save and back up all your restored data on another storage device in case of data recovery failure.
Note: Actually, in your case, if you have backed up everything important on another drive before, you would not have so many troubles. Therefore, you should learn a lesson to do regular data backup.