Fat file system recovery

Hi I have pen drive capacity of 4 GB. we are stored data in Pen drive in one system and we arew trying to download the data in another system.

while transfer the data power down is happen. after some the is came. again i am trying to down load the data from pen drive but i couldn’t because the data is in FOUND.000 folder and the file types are FileXXXXX.CHK.

could you please help us how to restore the data.