Lost Corrupted SDHC files?

I went to a concert last night and put my SanDisk 4GB SDHC card in my Nikon L120. I put the card in my laptop's SD slot to download the pictures and videos from the show, but it said there were no images found. I put it in the camera and it said ''File contains no image data''. I downloaded several ''file recovery'' sites for SD cards and all they will recover are the very old pictures that have been deleted. I really need my pictures and videos from last night. Someone please help me.

Added (1). I can view only three photos on the card while it's in my camera, and they are from last summer. None from the show.

Oh dear, you've done everything I think you can. It sounds like the card is corrupt. I think you've lost the photos.

The card will probably be exchanged by Sandisk under their warranty but that won't bring your pix back

Recommend the freeware PhotoRec. It's actually one of the best recovery programs:

Card Data Recovery is professional photo recovery software to recover deleted, lost, corrupted or formatted photos, videos, and auido files from various memory cards, such as, SDHC card, SD card, CF card, memory card, memory sticks, USB devices, digital cameras, hard drives, and zip drives.