Insert the SD card in a card reader and then try to recover the data by using the following:
Here are some tools to recover data:
1. Download and run ‘RECUVA’ (free) -
http
/www.piriform.com/recuva/download
2. 17 free tools here: http

/pcsupport.about.com/od/filerecovery/tp/free-file...
Good luck!