need program for fixing corrupted video file

Hello,

This my first mac and I was wondering if anyone knew of a program that could help me with the following problem...
I am trying to import videos from my Canon FS100 camcorder (videos are saved on an SD card) and when I plug in the camera to the USB port it can only import one of 9 photos and none of the video. I received a message stating that the files were in an unrecognizable format. I have used the camera and the same brand SD card before and had no trouble importing photo and videos. After about an hour on the phone with APPLE help services last night, the support person concluded that the SD card files had probably been corrupted. Is there a program I can use to fix the files so I can import them to iphoto? I know that the SD card needs to be reformatted before future use but was hoping to be able to use the videos in iphoto and imovie. The file extension of the video file is .MOI or .MOD. I have tried importing directly from the SD card as well but receive the same messages.
Thank you for any help!