OT corrupted lexar sd card

I had a brand new Lexar Professional SDXC card stop working during a shoot last week, it was in a Canon 60d, and a message popped up saying the card could not be recognised.

I've tried a few rescue software solutions, including Lexar's own rescue pro, and I can recover the quicktime files, they are the right length and size etc, but when I play them the video is black and the sound is white noise, with occasional bits of the original sound.

Is there any way I can fix these Quicktime files? Or is there another rescue package anyone can recommend?

Digital Rebellion has a QT file repair utility. No clue if it will work. If the files are too corrupted, they simply may not be repairable.