Copy them from the card before you format. But I don't think you worded the question properly here. Is the issue that you can't read the files from the card and it tells you that it needs to be formatted?
Also, for future reference, be careful how you move the files on your SD card, you should not eliminate, modify anything that is inside your card with nothing but the camera you are using it with, only copy the pictures directly to your PC.
and make sure you format the SD with the camera not the pc